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        "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": "2026-10-24T14:20:50.539Z"
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                "dateUpdated": "2026-10-24T14:20:50.539Z"
            },
            "title": "Distrust compromised intermediate certificates in ssl module",
            "problemTypes": [
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                    "descriptions": [
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                            "lang": "en",
                            "cweId": "CWE-299",
                            "description": "CWE-299 Improper check for certificate revocation",
                            "type": "CWE"
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            ],
            "affected": [
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                    "vendor": "Python Software Foundation",
                    "product": "CPython",
                    "repo": "https://github.com/python/cpython",
                    "modules": [
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                            "status": "affected",
                            "version": "0",
                            "lessThanOrEqual": "3.16.0",
                            "versionType": "python"
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                    "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.",
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            "references": [
                {
                    "url": "http://www.openwall.com/lists/oss-security/2026/10/20/29",
                    "tags": [
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                },
                {
                    "url": "https://github.com/python/cpython/pull/160042",
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                    "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/FNAJMZV6XQYLVPABNINDMF3VF66AYLW4/",
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                        "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"
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