CVE-2025-62706

{"id": "CVE-2025-62706", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-62706", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2025-10-23T15:44:18.329916Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "authlib", "product": "authlib", "versions": [{"status": "affected", "version": "< 1.6.5"}]}]}], "published": "2025-10-22T22:15:35.557", "references": [{"url": "https://github.com/authlib/authlib/commit/e0863d5129316b1790eee5f14cece32a03b8184d", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/authlib/authlib/security/advisories/GHSA-g7f3-828f-7h7m", "tags": ["Exploit", "Mitigation", "Third Party Advisory"], "source": "security-advisories@github.com"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00032.html", "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-400"}, {"lang": "en", "value": "CWE-770"}]}], "descriptions": [{"lang": "en", "value": "Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.5, Authlib\u2019s JWE zip=DEF path performs unbounded DEFLATE decompression. A very small ciphertext can expand into tens or hundreds of megabytes on decrypt, allowing an attacker who can supply decryptable tokens to exhaust memory and CPU and cause denial of service. This issue has been patched in version 1.6.5. Workarounds for this issue involve rejecting or stripping zip=DEF for inbound JWEs at the application boundary, forking and add a bounded decompression guard via decompressobj().decompress(data, MAX_SIZE)) and returning an error when output exceeds a safe limit, or enforcing strict maximum token sizes and fail fast on oversized inputs; combine with rate limiting."}, {"lang": "es", "value": "Authlib es una biblioteca Python que construye servidores OAuth y OpenID Connect. Antes de la versi\u00f3n 1.6.5, la ruta JWE zip=DEF de Authlib realiza una descompresi\u00f3n DEFLATE ilimitada. Un texto cifrado muy peque\u00f1o puede expandirse a decenas o cientos de megabytes al descifrar, permitiendo a un atacante que puede suministrar tokens descifrables agotar la memoria y la CPU y causar denegaci\u00f3n de servicio. Este problema ha sido parcheado en la versi\u00f3n 1.6.5. Las soluciones alternativas para este problema implican rechazar o eliminar zip=DEF para los JWE entrantes en el l\u00edmite de la aplicaci\u00f3n, bifurcar y a\u00f1adir una protecci\u00f3n de descompresi\u00f3n limitada a trav\u00e9s de decompressobj().decompress(data, MAX_SIZE)) y devolver un error cuando la salida excede un l\u00edmite seguro, o aplicar tama\u00f1os m\u00e1ximos de token estrictos y fallar r\u00e1pidamente en entradas sobredimensionadas; combinar con la limitaci\u00f3n de velocidad."}], "lastModified": "2026-10-19T13:10:00.110", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B4367901-9190-47A3-88FA-173EE7C2FB13", "versionEndExcluding": "1.6.5"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}