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{"cveTags": [], "descriptions": [{"lang": "en", "value": "Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.4, Authlib\u2019s JWS verification accepts tokens that declare unknown critical header parameters (crit), violating RFC 7515 \u201cmust\u2011understand\u201d semantics. An attacker can craft a signed token with a critical header (for example, bork or cnf) that strict verifiers reject but Authlib accepts. In mixed\u2011language fleets, this enables split\u2011brain verification and can lead to policy bypass, replay, or privilege escalation. This issue has been patched in version 1.6.4."}], "id": "CVE-2025-59420", "lastModified": "2025-09-22T21:22:33.590", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "[email protected]", "type": "Secondary"}]}, "published": "2025-09-22T18:15:46.910", "references": [{"source": "[email protected]", "url": "https://github.com/authlib/authlib/commit/6b1813e4392eb7c168c276099ff7783b176479df"}, {"source": "[email protected]", "url": "https://github.com/authlib/authlib/security/advisories/GHSA-9ggr-2464-2j32"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-345"}, {"lang": "en", "value": "CWE-863"}], "source": "[email protected]", "type": "Primary"}]}

{"bugzilla": {"description": "authlib: Authlib RFC violation", "id": "2397460", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2397460"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "status": "draft"}, "cwe": "(CWE-345|CWE-863)", "details": ["No description is available for this CVE."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2025-59420", "package_state": [{"cpe": "cpe:/a:redhat:quay:3", "fix_state": "Affected", "package_name": "quay/quay-rhel8", "product_name": "Red Hat Quay 3"}], "public_date": "2025-09-22T17:28:53Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-59420\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-59420\nhttps://github.com/authlib/authlib/commit/6b1813e4392eb7c168c276099ff7783b176479df\nhttps://github.com/authlib/authlib/security/advisories/GHSA-9ggr-2464-2j32"], "threat_severity": "Important"}