{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-114616", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-10-21T20:34:25.600Z", "datePublished": "2026-10-22T21:14:03.060Z", "dateUpdated": "2026-10-22T21:14:03.060Z"}, "containers": {"cna": {"title": "Authlib accepts an empty HMAC key, allowing JWS/JWT signature forgery (HS256/HS384/HS512)", "problemTypes": [{"descriptions": [{"cweId": "CWE-287", "lang": "en", "description": "CWE-287: Improper Authentication", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-326", "lang": "en", "description": "CWE-326: Inadequate Encryption Strength", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-1391", "lang": "en", "description": "CWE-1391: Use of Weak Credentials", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/authlib/authlib/security/advisories/GHSA-8m4g-j4wp-wgcg", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/authlib/authlib/security/advisories/GHSA-8m4g-j4wp-wgcg"}, {"name": "https://github.com/authlib/authlib/commit/4ff30db442c70e29486e1982cb0ad37c037f5f4b", "tags": ["x_refsource_MISC"], "url": "https://github.com/authlib/authlib/commit/4ff30db442c70e29486e1982cb0ad37c037f5f4b"}, {"name": "https://github.com/authlib/authlib/releases/tag/v1.9.1", "tags": ["x_refsource_MISC"], "url": "https://github.com/authlib/authlib/releases/tag/v1.9.1"}], "affected": [{"vendor": "authlib", "product": "authlib", "versions": [{"version": "< 1.9.1", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-22T21:14:03.060Z"}, "descriptions": [{"lang": "en", "value": "Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.1, Authlib's OctKey.import_key() and HMAC signing and verification path accept zero-length key material. If an application's secret lookup can return an empty string or empty bytes, a remote attacker can compute the deterministic HS256, HS384, or HS512 signature for arbitrary token claims and have Authlib treat the token as authentic. This issue is fixed in version 1.9.1."}], "source": {"advisory": "GHSA-8m4g-j4wp-wgcg", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "authlib", "vendor": "authlib", "versions": [{"status": "affected", "version": "< 1.9.1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.1, Authlib's OctKey.import_key() and HMAC signing and verification path accept zero-length key material. If an application's secret lookup can return an empty string or empty bytes, a remote attacker can compute the deterministic HS256, HS384, or HS512 signature for arbitrary token claims and have Authlib treat the token as authentic. This issue is fixed in version 1.9.1."}], "id": "CVE-2026-114616", "lastModified": "2026-10-22T22:18:04.420", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.2, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-10-22T22:18:04.420", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/authlib/authlib/commit/4ff30db442c70e29486e1982cb0ad37c037f5f4b"}, {"source": "security-advisories@github.com", "url": "https://github.com/authlib/authlib/releases/tag/v1.9.1"}, {"source": "security-advisories@github.com", "url": "https://github.com/authlib/authlib/security/advisories/GHSA-8m4g-j4wp-wgcg"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-287"}, {"lang": "en", "value": "CWE-326"}, {"lang": "en", "value": "CWE-1391"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.9.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "authlib", "source": "cna", "vendor": "authlib"}, "product": "authlib", "vendor": "authlib"}], "created": "2026-10-23T03:15:16.645936+00:00", "updated": "2026-10-23T03:30:15.778595+00:00", "vendors": ["authlib", "authlib$PRODUCT$authlib"]}