{"schema":"threatline.record/2","record":{"id":"CVE-2026-102946","aliases":["GHSA-4pp3-559j-c5c2"],"summary":"joserfc: JWS signature verification bypass via empty signatures array in jws.deserialize_json","details":"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.","categories":["Unclassified"],"product":"joserfc","vendor":"authlib","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-102946","source_modified_at":"2026-10-15T19:53:09.069Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"joserfc","vendor":"authlib","versions":[{"status":"affected","version":"< 1.7.4"}],"defaultStatus":null},{"source":"GitHub Advisory Database","source_url":"https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2","source_modified_at":"2026-09-29T21:12:16Z","fetched_at":"2026-10-23T19:00:29.328130Z","package":{"ecosystem":"pip","name":"joserfc"},"range":"1.7.3"}],"fixed_versions":[{"source":"GitHub Advisory Database","source_url":"https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2","source_modified_at":"2026-09-29T21:12:16Z","fetched_at":"2026-10-23T19:00:29.328130Z","package":{"ecosystem":"pip","name":"joserfc"},"version":"1.7.4"}],"cvss":9.1,"severity":"Critical","kev":{"listed":false},"epss":{"probability":0.00117,"percentile":0.01565,"score_date":"2026-10-23"},"published_at":"2026-10-15T18:28:06.913Z","modified_at":"2026-10-15T19:53:09.069Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-102946","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-15T19:53:09.069Z"},{"source":"GitHub Advisory Database","url":"https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2","fetched_at":"2026-10-23T19:00:29.328130Z","source_modified_at":"2026-09-29T21:12:16Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-102946","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","GitHub Advisory Database","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2","tags":["exploit"]},{"source":"CVE List","url":"https://github.com/authlib/joserfc/commit/f409f8f058225d7686acab6546c94593e4c1bfbe","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/authlib/joserfc/releases/tag/1.7.4","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"poc","automatable":"yes","technical_impact":"total","assessed_at":"2026-10-15T19:52:38.661517Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-15T19:53:09.069Z","content_hash":"68203a056454b031fdabbb92f88641c734f40da93d44f8774b71e7b0ebf99b60"}}