{
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    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-3644",
        "assignerOrgId": "28c92f92-d60d-412d-b760-e73465c3df22",
        "state": "PUBLISHED",
        "assignerShortName": "PSF",
        "dateReserved": "2026-03-06T16:13:09.289Z",
        "datePublished": "2026-03-16T17:37:31.344Z",
        "dateUpdated": "2026-08-13T00:27:41.980Z"
    },
    "containers": {
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            "affected": [
                {
                    "defaultStatus": "unaffected",
                    "modules": [
                        "http.cookies"
                    ],
                    "product": "CPython",
                    "repo": "https://github.com/python/cpython",
                    "vendor": "Python Software Foundation",
                    "versions": [
                        {
                            "version": "0",
                            "lessThan": "3.10.21",
                            "status": "affected",
                            "versionType": "python"
                        },
                        {
                            "version": "3.11.0",
                            "lessThan": "3.11.16",
                            "status": "affected",
                            "versionType": "python"
                        },
                        {
                            "version": "3.12.0",
                            "lessThan": "3.12.14",
                            "status": "affected",
                            "versionType": "python"
                        },
                        {
                            "version": "3.13.0",
                            "lessThan": "3.13.13",
                            "status": "affected",
                            "versionType": "python"
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                        {
                            "version": "3.14.0",
                            "lessThan": "3.14.4",
                            "status": "affected",
                            "versionType": "python"
                        },
                        {
                            "version": "3.15.0a1",
                            "lessThan": "3.15.0a8",
                            "status": "affected",
                            "versionType": "python"
                        }
                    ]
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "coordinator",
                    "value": "Stan Ulbrych"
                },
                {
                    "lang": "en",
                    "type": "remediation developer",
                    "value": "Stan Ulbrych"
                },
                {
                    "lang": "en",
                    "type": "remediation reviewer",
                    "value": "Victor Stinner"
                },
                {
                    "lang": "en",
                    "type": "remediation reviewer",
                    "value": "Seth Larson"
                },
                {
                    "lang": "en",
                    "type": "reporter",
                    "value": "Vyom Yadav"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "The fix for CVE-2026-0672, which rejected control characters in http.cookies.Morsel, was incomplete. The Morsel.update(), |= operator, and unpickling paths were not patched, allowing control characters to bypass input validation. Additionally, BaseCookie.js_output() lacked the output validation applied to BaseCookie.output()."
                        }
                    ],
                    "value": "The fix for CVE-2026-0672, which rejected control characters in http.cookies.Morsel, was incomplete. The Morsel.update(), |= operator, and unpickling paths were not patched, allowing control characters to bypass input validation. Additionally, BaseCookie.js_output() lacked the output validation applied to BaseCookie.output()."
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "Automatable": "NOT_DEFINED",
                        "Recovery": "NOT_DEFINED",
                        "Safety": "NOT_DEFINED",
                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "attackVector": "NETWORK",
                        "baseScore": 6,
                        "baseSeverity": "MEDIUM",
                        "exploitMaturity": "NOT_DEFINED",
                        "privilegesRequired": "LOW",
                        "providerUrgency": "NOT_DEFINED",
                        "subAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "userInteraction": "NONE",
                        "valueDensity": "NOT_DEFINED",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N",
                        "version": "4.0",
                        "vulnAvailabilityImpact": "NONE",
                        "vulnConfidentialityImpact": "LOW",
                        "vulnIntegrityImpact": "HIGH",
                        "vulnerabilityResponseEffort": "NOT_DEFINED"
                    },
                    "format": "CVSS",
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ]
                }
            ],
            "providerMetadata": {
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                "shortName": "PSF",
                "dateUpdated": "2026-08-13T00:27:41.980Z"
            },
            "references": [
                {
                    "tags": [
                        "vendor-advisory"
                    ],
                    "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/H6CADMBCDRFGWCMOXWUIHFJNV43GABJ7/"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/python/cpython/commit/57e88c1cf95e1481b94ae57abe1010469d47a6b4"
                },
                {
                    "tags": [
                        "issue-tracking"
                    ],
                    "url": "https://github.com/python/cpython/issues/145599"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/python/cpython/pull/145600"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/python/cpython/commit/62ceb396fcbe69da1ded3702de586f4072b590dd"
                },
                {
                    "tags": [
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                    ],
                    "url": "https://github.com/python/cpython/commit/d16ecc6c3626f0e2cc8f08c309c83934e8a979dd"
                },
                {
                    "tags": [
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                    "url": "https://github.com/python/cpython/commit/556aa098e738b127c714866f819b4abe2f7593d8"
                },
                {
                    "tags": [
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                    "url": "https://github.com/python/cpython/commit/dae4b1a21f8df4570e30986affd61bbe4ade4cef"
                },
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                    "url": "https://github.com/python/cpython/commit/3974092b037f9a3b000fb15b48ea61ce3b25d330"
                }
            ],
            "source": {
                "discovery": "UNKNOWN"
            },
            "title": "Incomplete control character validation in http.cookies",
            "x_generator": {
                "engine": "Vulnogram 1.0.0"
            }
        },
        "adp": [
            {
                "problemTypes": [
                    {
                        "descriptions": [
                            {
                                "type": "CWE",
                                "cweId": "CWE-20",
                                "lang": "en",
                                "description": "CWE-20 Improper Input Validation"
                            }
                        ]
                    },
                    {
                        "descriptions": [
                            {
                                "type": "CWE",
                                "cweId": "CWE-116",
                                "lang": "en",
                                "description": "CWE-116 Improper Encoding or Escaping of Output"
                            }
                        ]
                    }
                ],
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-03-16T18:25:27.051552Z",
                                "id": "CVE-2026-3644",
                                "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": "2026-03-16T18:25:55.021Z"
                }
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    }
}