{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-102946","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-09-29T20:24:43.341Z","datePublished":"2026-10-15T18:28:06.913Z","dateUpdated":"2026-10-15T19:53:09.069Z"},"containers":{"cna":{"title":"joserfc: JWS signature verification bypass via empty signatures array in jws.deserialize_json","problemTypes":[{"descriptions":[{"cweId":"CWE-290","lang":"en","description":"CWE-290: Authentication Bypass by Spoofing","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-345","lang":"en","description":"CWE-345: Insufficient Verification of Data Authenticity","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-347","lang":"en","description":"CWE-347: Improper Verification of Cryptographic Signature","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2","tags":["x_refsource_CONFIRM"],"url":"https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2"},{"name":"https://github.com/authlib/joserfc/commit/f409f8f058225d7686acab6546c94593e4c1bfbe","tags":["x_refsource_MISC"],"url":"https://github.com/authlib/joserfc/commit/f409f8f058225d7686acab6546c94593e4c1bfbe"},{"name":"https://github.com/authlib/joserfc/releases/tag/1.7.4","tags":["x_refsource_MISC"],"url":"https://github.com/authlib/joserfc/releases/tag/1.7.4"}],"affected":[{"vendor":"authlib","product":"joserfc","versions":[{"version":"< 1.7.4","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-10-15T18:28:06.913Z"},"descriptions":[{"lang":"en","value":"joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to 1.7.4, joserfc.jws.deserialize_json() accepts a JWS General JSON Serialization with an empty signatures array as authenticated. The verify_general_json() loop performs no iterations for the empty array and returns success because no signature check failed, allowing an attacker without a signing key to supply an arbitrary payload that relying applications may treat as authentic. The issue affects the General JSON Serialization path; compact JWS and JWT decoding, Flattened JSON serialization, and JWE JSON processing do not follow this vulnerable path. This issue is fixed in version 1.7.4."}],"source":{"advisory":"GHSA-4pp3-559j-c5c2","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-15T19:52:38.661517Z","id":"CVE-2026-102946","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"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":"2026-10-15T19:53:09.069Z"}}]}}