CVE-2025-61920

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{"affected": [{"affectedData": [{"product": "authlib", "vendor": "authlib", "versions": [{"status": "affected", "version": "< 1.6.5"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:*", "matchCriteriaId": "B4367901-9190-47A3-88FA-173EE7C2FB13", "versionEndExcluding": "1.6.5", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.5, Authlib\u2019s JOSE implementation accepts unbounded JWS/JWT header and signature segments. A remote attacker can craft a token whose base64url\u2011encoded header or signature spans hundreds of megabytes. During verification, Authlib decodes and parses the full input before it is rejected, driving CPU and memory consumption to hostile levels and enabling denial of service. Version 1.6.5 patches the issue. Some temporary workarounds are available. Enforce input size limits before handing tokens to Authlib and/or use application-level throttling to reduce amplification risk."}, {"lang": "es", "value": "Authlib es una biblioteca de Python que construye servidores OAuth y OpenID Connect. Antes de la versi\u00f3n 1.6.5, la implementaci\u00f3n JOSE de Authlib acepta segmentos de encabezado y firma JWS/JWT ilimitados. Un atacante remoto puede crear un token cuyo encabezado o firma codificados en base64url abarca cientos de megabytes. Durante la verificaci\u00f3n, Authlib decodifica y analiza la entrada completa antes de que sea rechazada, llevando el consumo de CPU y memoria a niveles hostiles y permitiendo la denegaci\u00f3n de servicio. La versi\u00f3n 1.6.5 corrige el problema. Algunas soluciones temporales est\u00e1n disponibles. Imponga l\u00edmites de tama\u00f1o de entrada antes de entregar tokens a Authlib y/o use la limitaci\u00f3n a nivel de aplicaci\u00f3n para reducir el riesgo de amplificaci\u00f3n."}], "id": "CVE-2025-61920", "lastModified": "2026-10-19T16:10:00.260", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-61920", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-10-10T20:46:55.883426Z", "version": "2.0.3"}}]}, "published": "2025-10-10T20:15:37.893", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/authlib/authlib/commit/867e3f87b072347a1ae9cf6983cc8bbf88447e5e"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "url": "https://github.com/authlib/authlib/security/advisories/GHSA-pq5p-34cr-23v9"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00032.html"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}, {"lang": "en", "value": "CWE-400"}, {"lang": "en", "value": "CWE-770"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "authlib: Authlib Denial of Service", "id": "2403179", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2403179"}, "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:N/A:H", "status": "draft"}, "cwe": "(CWE-20|CWE-400|CWE-770)", "details": ["No description is available for this CVE."], "mitigation": {"lang": "en:us", "value": "Users unable to upgrade may manually enforce input size limits before handing tokens to Authlib and/or use application-level throttling to reduce amplification risk."}, "name": "CVE-2025-61920", "package_state": [{"cpe": "cpe:/a:redhat:quay:3", "fix_state": "Affected", "package_name": "quay/quay-rhel8", "product_name": "Red Hat Quay 3"}], "public_date": "2025-10-10T19:25:07Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-61920\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-61920\nhttps://github.com/authlib/authlib/commit/867e3f87b072347a1ae9cf6983cc8bbf88447e5e\nhttps://github.com/authlib/authlib/security/advisories/GHSA-pq5p-34cr-23v9"], "threat_severity": "Important"}

{"created": "2025-10-20T16:17:10.699725+00:00", "updated": "2025-10-20T16:17:10.699751+00:00", "vendors": ["authlib", "authlib$PRODUCT$authlib"]}