{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-87866",
        "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
        "state": "PUBLISHED",
        "assignerShortName": "curl",
        "dateReserved": "2026-09-09T13:17:42.764Z",
        "datePublished": "2026-10-20T20:16:30.866Z",
        "dateUpdated": "2026-10-29T18:59:00.981Z"
    },
    "containers": {
        "cna": {
            "title": "wolfSSL public-key pinning bypass",
            "descriptions": [
                {
                    "lang": "en",
                    "value": "When built with wolfSSL, curl can successfully validate a pinned public key\nhash against a key the TLS peer does not possess. During the TLS handshake,\nwolfSSL validates the connection, but curl's subsequent re-parsing of the same\ncertificate - tricked by a manipulated validity length field - extracts and\nmatches a different embedded key, incorrectly authorizing the pinned public\nkey."
                }
            ],
            "providerMetadata": {
                "orgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
                "shortName": "curl",
                "dateUpdated": "2026-10-20T20:16:30.866Z"
            },
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "description": "CWE-295 Improper Certificate Validation"
                        }
                    ]
                }
            ],
            "affected": [
                {
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                    ],
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                }
            ],
            "references": [
                {
                    "url": "https://curl.se/docs/CVE-2026-87866.json",
                    "name": "json"
                },
                {
                    "url": "https://curl.se/docs/CVE-2026-87866.html",
                    "name": "www"
                },
                {
                    "url": "https://hackerone.com/reports/3989514",
                    "name": "issue"
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "Muhamad Arga Reksapati",
                    "type": "finder"
                },
                {
                    "lang": "en",
                    "value": "Stefan Eissing",
                    "type": "remediation developer"
                }
            ]
        },
        "adp": [
            {
                "problemTypes": [
                    {
                        "descriptions": [
                            {
                                "type": "CWE",
                                "cweId": "CWE-295",
                                "lang": "en",
                                "description": "CWE-295 Improper Certificate Validation"
                            }
                        ]
                    }
                ],
                "references": [
                    {
                        "url": "https://hackerone.com/reports/3989514",
                        "tags": [
                            "exploit"
                        ]
                    }
                ],
                "metrics": [
                    {
                        "cvssV3_1": {
                            "scope": "UNCHANGED",
                            "version": "3.1",
                            "baseScore": 9.1,
                            "attackVector": "NETWORK",
                            "baseSeverity": "CRITICAL",
                            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
                            "integrityImpact": "HIGH",
                            "userInteraction": "NONE",
                            "attackComplexity": "LOW",
                            "availabilityImpact": "NONE",
                            "privilegesRequired": "NONE",
                            "confidentialityImpact": "HIGH"
                        }
                    },
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-10-29T18:58:30.759022Z",
                                "id": "CVE-2026-87866",
                                "options": [
                                    {
                                        "Exploitation": "poc"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "total"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-10-29T18:59:00.981Z"
                }
            }
        ]
    }
}