{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-115557",
        "assignerOrgId": "28c92f92-d60d-412d-b760-e73465c3df22",
        "state": "PUBLISHED",
        "assignerShortName": "PSF",
        "dateReserved": "2026-10-22T21:32:20.396Z",
        "datePublished": "2026-10-24T14:15:14.283Z",
        "dateUpdated": "2026-10-25T00:39:26.520Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "28c92f92-d60d-412d-b760-e73465c3df22",
                "shortName": "PSF",
                "dateUpdated": "2026-10-25T00:39:26.520Z"
            },
            "title": "Distrust compromised intermediate certificates in ssl module",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-299",
                            "description": "CWE-299 Improper check for certificate revocation",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "Python Software Foundation",
                    "product": "CPython",
                    "repo": "https://github.com/python/cpython",
                    "modules": [
                        "ssl"
                    ],
                    "versions": [
                        {
                            "version": "0",
                            "lessThan": "3.16.0",
                            "status": "affected",
                            "versionType": "python"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Python has added a denylist for known compromised certificates to the \"ssl\" module to ensure user safety even without certificate revocation configured. Known compromised certificates will automatically be rejected regardless of the SSLContext policy configuration.",
                    "supportingMedia": [
                        {
                            "type": "text/html",
                            "base64": false,
                            "value": "Python has added a denylist for known compromised certificates to the \"ssl\" module to ensure user safety even without certificate revocation configured. Known compromised certificates will automatically be rejected regardless of the SSLContext policy configuration."
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "http://www.openwall.com/lists/oss-security/2026/10/20/29",
                    "tags": [
                        "related"
                    ]
                },
                {
                    "url": "https://github.com/python/cpython/pull/160042",
                    "tags": [
                        "patch"
                    ]
                },
                {
                    "url": "https://github.com/python/cpython/issues/160040",
                    "tags": [
                        "issue-tracking"
                    ]
                },
                {
                    "url": "https://emudhra.we-have-a-problem.com/",
                    "tags": [
                        "third-party-advisory"
                    ]
                },
                {
                    "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/FNAJMZV6XQYLVPABNINDMF3VF66AYLW4/",
                    "tags": [
                        "vendor-advisory"
                    ]
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/python/cpython/commit/21a50891ab4be2e9955239e625ae2b40c6b1854d"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/python/cpython/commit/36cd295f32fc9ba19399e01abee91231440a41dd"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/python/cpython/commit/48d9b2712cd52206c7a5882d0fdca4863ed65e93"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/python/cpython/commit/7dd8b4736a1419750b94a388e6d158be15836fe6"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/python/cpython/commit/98f0e4ed349f370dc8a00366da1a9797e11c9ed5"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/python/cpython/commit/a17d9ef549008133eadf20689b1f4787902efe5b"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/python/cpython/commit/af52b41afa4330fb38583db553631baa2f122f90"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/python/cpython/commit/c7fd7edf7e0d122a3973cf676fae21b6aaa650a8"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/python/cpython/commit/e2a9dd97ef9571c710ac0afaa834c8879aebce78"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/python/cpython/commit/e4500d8a437ee5b988a5410cb9b59d177aa01370"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/python/cpython/commit/e4f63e65a93cf44c14274aa987e644b8c003625e"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/python/cpython/commit/e9bf2cf84eebf838a1edaa1c648c2b36345b99d3"
                }
            ],
            "metrics": [
                {
                    "format": "CVSS",
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ],
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "PASSIVE",
                        "vulnConfidentialityImpact": "HIGH",
                        "subConfidentialityImpact": "HIGH",
                        "vulnIntegrityImpact": "HIGH",
                        "subIntegrityImpact": "HIGH",
                        "vulnAvailabilityImpact": "HIGH",
                        "subAvailabilityImpact": "HIGH",
                        "exploitMaturity": "NOT_DEFINED",
                        "Safety": "NOT_DEFINED",
                        "Automatable": "NOT_DEFINED",
                        "Recovery": "NOT_DEFINED",
                        "valueDensity": "NOT_DEFINED",
                        "vulnerabilityResponseEffort": "NOT_DEFINED",
                        "providerUrgency": "NOT_DEFINED",
                        "version": "4.0",
                        "baseSeverity": "CRITICAL",
                        "baseScore": 9.4,
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"
                    }
                }
            ],
            "source": {
                "discovery": "UNKNOWN"
            },
            "x_generator": {
                "engine": "Vulnogram 1.0.5"
            }
        },
        "adp": [
            {
                "title": "CVE Program Container",
                "references": [
                    {
                        "url": "http://www.openwall.com/lists/oss-security/2026/10/24/5"
                    }
                ],
                "providerMetadata": {
                    "orgId": "af854a3a-2127-422b-91ae-364da2661108",
                    "shortName": "CVE",
                    "dateUpdated": "2026-10-24T18:07:53.662Z"
                }
            }
        ]
    }
}