{"id":"CVE-2026-102946","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.","aliases":["GHSA-4pp3-559j-c5c2"],"modified":"2026-10-17T02:47:45.183931142Z","published":"2026-10-15T18:28:06.913Z","database_specific":{"cwe_ids":["CWE-290","CWE-345","CWE-347"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102946.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/authlib/joserfc/releases/tag/1.7.4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102946.json"},{"type":"ADVISORY","url":"https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102946"},{"type":"FIX","url":"https://github.com/authlib/joserfc/commit/f409f8f058225d7686acab6546c94593e4c1bfbe"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/authlib/joserfc","events":[{"introduced":"0"},{"fixed":"f409f8f058225d7686acab6546c94593e4c1bfbe"},{"fixed":"7facdee77fc8735ad88e586b31c5b0c940ee0a78"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.7.4"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["1.7.3","1.7.2","1.7.1","1.7.0","1.6.7","1.6.5","1.6.4","1.6.3","1.6.2","1.6.1","1.6.0","1.5.0","1.4.3","1.4.1","1.4.0","1.3.3","1.3.2","1.3.1","1.3.0","1.2.2","1.2.1","1.2.0","1.1.0","1.0.4","1.0.3","1.0.2","1.0.1","1.0.0","0.12.0","0.11.1","0.11.0","0.10.0","0.9.0","0.8.0","0.7.0","0.6.0","0.5.0","0.4.0","0.3.0","0.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-102946.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}