{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-4873",
        "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
        "state": "PUBLISHED",
        "assignerShortName": "curl",
        "dateReserved": "2026-03-26T05:38:02.098Z",
        "datePublished": "2026-05-13T08:27:04.538Z",
        "dateUpdated": "2026-09-15T06:02:57.389Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
                "shortName": "curl",
                "dateUpdated": "2026-09-15T06:02:57.389Z"
            },
            "title": "connection reuse ignores TLS requirement",
            "descriptions": [
                {
                    "lang": "en",
                    "value": "A vulnerability exists where a connection requiring TLS incorrectly reuses an\nexisting unencrypted connection from the same connection pool. If an initial\ntransfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request\nto that same host bypasses the TLS requirement and instead transmit data\nunencrypted."
                }
            ],
            "affected": [
                {
                    "vendor": "curl",
                    "product": "curl",
                    "versions": [
                        {
                            "version": "7.20.0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "8.14.2"
                        },
                        {
                            "version": "8.15.0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "8.16.1"
                        },
                        {
                            "version": "8.17.0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "8.20.0"
                        }
                    ],
                    "defaultStatus": "unaffected"
                },
                {
                    "vendor": "curl",
                    "product": "curl",
                    "versions": [
                        {
                            "version": "ec3bb8f727405642a471b4b1b9eb0118fc003104",
                            "status": "affected",
                            "versionType": "git",
                            "lessThan": "507e7be573b0a76fca597b75ff7cb27a66e7d865"
                        }
                    ],
                    "defaultStatus": "unaffected",
                    "repo": "https://github.com/curl/curl.git"
                },
                {
                    "vendor": "curl",
                    "product": "curl",
                    "versions": [
                        {
                            "version": "8.19.0",
                            "status": "affected"
                        },
                        {
                            "version": "8.18.0",
                            "status": "affected"
                        },
                        {
                            "version": "8.17.0",
                            "status": "affected"
                        },
                        {
                            "version": "8.16.0",
                            "status": "affected"
                        },
                        {
                            "version": "8.15.0",
                            "status": "affected"
                        },
                        {
                            "version": "8.14.1",
                            "status": "affected"
                        },
                        {
                            "version": "8.14.0",
                            "status": "affected"
                        },
                        {
                            "version": "8.13.0",
                            "status": "affected"
                        },
                        {
                            "version": "8.12.1",
                            "status": "affected"
                        },
                        {
                            "version": "8.12.0",
                            "status": "affected"
                        },
                        {
                            "version": "8.11.1",
                            "status": "affected"
                        },
                        {
                            "version": "8.11.0",
                            "status": "affected"
                        },
                        {
                            "version": "8.10.1",
                            "status": "affected"
                        },
                        {
                            "version": "8.10.0",
                            "status": "affected"
                        },
                        {
                            "version": "8.9.1",
                            "status": "affected"
                        },
                        {
                            "version": "8.9.0",
                            "status": "affected"
                        },
                        {
                            "version": "8.8.0",
                            "status": "affected"
                        },
                        {
                            "version": "8.7.1",
                            "status": "affected"
                        },
                        {
                            "version": "8.7.0",
                            "status": "affected"
                        },
                        {
                            "version": "8.6.0",
                            "status": "affected"
                        },
                        {
                            "version": "8.5.0",
                            "status": "affected"
                        },
                        {
                            "version": "8.4.0",
                            "status": "affected"
                        },
                        {
                            "version": "8.3.0",
                            "status": "affected"
                        },
                        {
                            "version": "8.2.1",
                            "status": "affected"
                        },
                        {
                            "version": "8.2.0",
                            "status": "affected"
                        },
                        {
                            "version": "8.1.2",
                            "status": "affected"
                        },
                        {
                            "version": "8.1.1",
                            "status": "affected"
                        },
                        {
                            "version": "8.1.0",
                            "status": "affected"
                        },
                        {
                            "version": "8.0.1",
                            "status": "affected"
                        },
                        {
                            "version": "8.0.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.88.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.88.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.87.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.86.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.85.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.84.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.83.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.83.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.82.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.81.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.80.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.79.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.79.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.78.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.77.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.76.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.76.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.75.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.74.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.73.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.72.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.71.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.71.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.70.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.69.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.69.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.68.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.67.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.66.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.65.3",
                            "status": "affected"
                        },
                        {
                            "version": "7.65.2",
                            "status": "affected"
                        },
                        {
                            "version": "7.65.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.65.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.64.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.64.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.63.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.62.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.61.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.61.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.60.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.59.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.58.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.57.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.56.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.56.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.55.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.55.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.54.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.54.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.53.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.53.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.52.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.52.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.51.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.50.3",
                            "status": "affected"
                        },
                        {
                            "version": "7.50.2",
                            "status": "affected"
                        },
                        {
                            "version": "7.50.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.50.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.49.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.49.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.48.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.47.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.47.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.46.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.45.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.44.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.43.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.42.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.42.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.41.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.40.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.39.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.38.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.37.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.37.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.36.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.35.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.34.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.33.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.32.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.31.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.30.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.29.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.28.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.28.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.27.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.26.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.25.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.24.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.23.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.23.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.22.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.21.7",
                            "status": "affected"
                        },
                        {
                            "version": "7.21.6",
                            "status": "affected"
                        },
                        {
                            "version": "7.21.5",
                            "status": "affected"
                        },
                        {
                            "version": "7.21.4",
                            "status": "affected"
                        },
                        {
                            "version": "7.21.3",
                            "status": "affected"
                        },
                        {
                            "version": "7.21.2",
                            "status": "affected"
                        },
                        {
                            "version": "7.21.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.21.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.20.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.20.0",
                            "status": "affected"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }
            ],
            "references": [
                {
                    "url": "https://curl.se/docs/CVE-2026-4873.json"
                },
                {
                    "url": "https://curl.se/docs/CVE-2026-4873.html"
                },
                {
                    "url": "https://hackerone.com/reports/3621851"
                }
            ],
            "x_osv": {
                "schema_version": "1.5.0",
                "id": "CURL-CVE-2026-4873",
                "aliases": [
                    "CVE-2026-4873"
                ],
                "summary": "connection reuse ignores TLS requirement",
                "modified": "2026-09-07T10:34:51.00Z",
                "database_specific": {
                    "package": "curl",
                    "affects": "both",
                    "URL": "https://curl.se/docs/CVE-2026-4873.json",
                    "www": "https://curl.se/docs/CVE-2026-4873.html",
                    "issue": "https://hackerone.com/reports/3621851",
                    "CWE": {
                        "id": "CWE-319",
                        "desc": "Cleartext Transmission of Sensitive Information"
                    },
                    "last_affected": "8.19.0",
                    "severity": "Low"
                },
                "published": "2026-04-29T08:00:00.00Z",
                "affected": [
                    {
                        "ranges": [
                            {
                                "type": "SEMVER",
                                "events": [
                                    {
                                        "introduced": "7.20.0"
                                    },
                                    {
                                        "fixed": "8.14.2"
                                    },
                                    {
                                        "introduced": "8.15.0"
                                    },
                                    {
                                        "fixed": "8.16.1"
                                    },
                                    {
                                        "introduced": "8.17.0"
                                    },
                                    {
                                        "fixed": "8.20.0"
                                    }
                                ]
                            },
                            {
                                "type": "GIT",
                                "repo": "https://github.com/curl/curl.git",
                                "events": [
                                    {
                                        "introduced": "ec3bb8f727405642a471b4b1b9eb0118fc003104"
                                    },
                                    {
                                        "fixed": "507e7be573b0a76fca597b75ff7cb27a66e7d865"
                                    }
                                ]
                            }
                        ],
                        "versions": [
                            "8.19.0",
                            "8.18.0",
                            "8.17.0",
                            "8.16.0",
                            "8.15.0",
                            "8.14.1",
                            "8.14.0",
                            "8.13.0",
                            "8.12.1",
                            "8.12.0",
                            "8.11.1",
                            "8.11.0",
                            "8.10.1",
                            "8.10.0",
                            "8.9.1",
                            "8.9.0",
                            "8.8.0",
                            "8.7.1",
                            "8.7.0",
                            "8.6.0",
                            "8.5.0",
                            "8.4.0",
                            "8.3.0",
                            "8.2.1",
                            "8.2.0",
                            "8.1.2",
                            "8.1.1",
                            "8.1.0",
                            "8.0.1",
                            "8.0.0",
                            "7.88.1",
                            "7.88.0",
                            "7.87.0",
                            "7.86.0",
                            "7.85.0",
                            "7.84.0",
                            "7.83.1",
                            "7.83.0",
                            "7.82.0",
                            "7.81.0",
                            "7.80.0",
                            "7.79.1",
                            "7.79.0",
                            "7.78.0",
                            "7.77.0",
                            "7.76.1",
                            "7.76.0",
                            "7.75.0",
                            "7.74.0",
                            "7.73.0",
                            "7.72.0",
                            "7.71.1",
                            "7.71.0",
                            "7.70.0",
                            "7.69.1",
                            "7.69.0",
                            "7.68.0",
                            "7.67.0",
                            "7.66.0",
                            "7.65.3",
                            "7.65.2",
                            "7.65.1",
                            "7.65.0",
                            "7.64.1",
                            "7.64.0",
                            "7.63.0",
                            "7.62.0",
                            "7.61.1",
                            "7.61.0",
                            "7.60.0",
                            "7.59.0",
                            "7.58.0",
                            "7.57.0",
                            "7.56.1",
                            "7.56.0",
                            "7.55.1",
                            "7.55.0",
                            "7.54.1",
                            "7.54.0",
                            "7.53.1",
                            "7.53.0",
                            "7.52.1",
                            "7.52.0",
                            "7.51.0",
                            "7.50.3",
                            "7.50.2",
                            "7.50.1",
                            "7.50.0",
                            "7.49.1",
                            "7.49.0",
                            "7.48.0",
                            "7.47.1",
                            "7.47.0",
                            "7.46.0",
                            "7.45.0",
                            "7.44.0",
                            "7.43.0",
                            "7.42.1",
                            "7.42.0",
                            "7.41.0",
                            "7.40.0",
                            "7.39.0",
                            "7.38.0",
                            "7.37.1",
                            "7.37.0",
                            "7.36.0",
                            "7.35.0",
                            "7.34.0",
                            "7.33.0",
                            "7.32.0",
                            "7.31.0",
                            "7.30.0",
                            "7.29.0",
                            "7.28.1",
                            "7.28.0",
                            "7.27.0",
                            "7.26.0",
                            "7.25.0",
                            "7.24.0",
                            "7.23.1",
                            "7.23.0",
                            "7.22.0",
                            "7.21.7",
                            "7.21.6",
                            "7.21.5",
                            "7.21.4",
                            "7.21.3",
                            "7.21.2",
                            "7.21.1",
                            "7.21.0",
                            "7.20.1",
                            "7.20.0"
                        ]
                    }
                ],
                "credits": [
                    {
                        "name": "Arkadi Vainbrand",
                        "type": "finder"
                    },
                    {
                        "name": "Daniel Stenberg",
                        "type": "remediation developer"
                    }
                ],
                "details": "A vulnerability exists where a connection requiring TLS incorrectly reuses an\nexisting unencrypted connection from the same connection pool. If an initial\ntransfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request\nto that same host bypasses the TLS requirement and instead transmit data\nunencrypted."
            },
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "description": "Cleartext Transmission of Sensitive Information",
                            "cweId": "CWE-319",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "Arkadi Vainbrand",
                    "type": "finder"
                },
                {
                    "lang": "en",
                    "value": "Daniel Stenberg",
                    "type": "remediation developer"
                }
            ],
            "x_generator": {
                "engine": "cvelib 1.8.0"
            }
        },
        "adp": [
            {
                "title": "CVE Program Container",
                "references": [
                    {
                        "url": "http://www.openwall.com/lists/oss-security/2026/04/29/7"
                    }
                ],
                "providerMetadata": {
                    "orgId": "af854a3a-2127-422b-91ae-364da2661108",
                    "shortName": "CVE",
                    "dateUpdated": "2026-05-13T09:05:12.559Z"
                }
            },
            {
                "problemTypes": [
                    {
                        "descriptions": [
                            {
                                "type": "CWE",
                                "cweId": "CWE-319",
                                "lang": "en",
                                "description": "CWE-319 Cleartext Transmission of Sensitive Information"
                            }
                        ]
                    }
                ],
                "metrics": [
                    {
                        "cvssV3_1": {
                            "scope": "UNCHANGED",
                            "version": "3.1",
                            "baseScore": 5.9,
                            "attackVector": "NETWORK",
                            "baseSeverity": "MEDIUM",
                            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
                            "integrityImpact": "NONE",
                            "userInteraction": "NONE",
                            "attackComplexity": "HIGH",
                            "availabilityImpact": "NONE",
                            "privilegesRequired": "NONE",
                            "confidentialityImpact": "HIGH"
                        }
                    },
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-05-13T19:29:14.521822Z",
                                "id": "CVE-2026-4873",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-05-13T19:30:04.825Z"
                }
            }
        ]
    }
}