{"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":"2026-10-30T20:07:37.170Z"},"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"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-30T20:07:25.381279Z","id":"CVE-2026-114616","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-10-30T20:07:37.170Z"}}]}}