{"id":"CVE-2026-102946","revision":"c082cbd24ca74b3093528c71422f5f81","records":[{"revision":"c082cbd24ca74b3093528c71422f5f81","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-102946","aliases":[],"title":"joserfc: JWS signature verification bypass via empty signatures array in jws.deserialize_json","description":"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.","state":0,"publishedAt":"2026-10-15T18:28:06.913+00:00","modifiedAt":"2026-10-15T19:53:09.069+00:00","affected":[{"ecosystem":"Vendor product","name":"joserfc","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"authlib\",\n                    \"product\": \"joserfc\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.7.4\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1,"severity":"CRITICAL"}],"references":["https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2","https://github.com/authlib/joserfc/commit/f409f8f058225d7686acab6546c94593e4c1bfbe","https://github.com/authlib/joserfc/releases/tag/1.7.4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-102946","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-102946","identifiers":["CVE-2026-102946"]},"retained":false,"historicalAffected":[]}],"coverage":[]}