{"id":"CVE-2026-102946","aliases":["DEBIAN-CVE-2026-102946","EUVD-2026-102310","GHSA-4pp3-559j-c5c2","UBUNTU-CVE-2026-102946","openSUSE-SU-2026:12204-1","openSUSE-SU-2026:22136-1"],"status":"published","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.","severity":{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00117,"percentile":0.0166,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-290","CWE-345","CWE-347"],"published":"2026-10-15T18:28:06Z","modified":"2026-10-28T17:50:29Z","fixes":[{"ecosystem":"Debian:14","package":"joserfc","fixed_in":["1.7.4-1"],"sources":["osv"]},{"ecosystem":"openSUSE:Tumbleweed","package":"python-joserfc","fixed_in":["1.7.7-1.1"],"sources":["osv"]},{"ecosystem":"openSUSE:Leap 16.0","package":"python-joserfc","fixed_in":["1.1.0-bp160.5.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:13","package":"joserfc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.0-1","1.2.0-1","1.2.2-1","1.3.1-1","1.3.2-1","1.3.4-1","1.4.0-1","1.4.1-1","1.4.3-1","1.5.0-1","1.6.0-1","1.6.1-1","1.6.2-1","1.6.3-1","1.6.4-1","1.6.5-1","1.6.8-1","1.7.0-1","1.7.1-1","1.7.2-1","1.7.3-1","1.7.4-1","1.7.5-1"]},{"source":"osv","ecosystem":"Debian:14","package":"joserfc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.4-1"}]}],"versions":["1.1.0-1","1.2.0-1","1.2.2-1","1.3.1-1","1.3.2-1","1.3.4-1","1.4.0-1","1.4.1-1","1.4.3-1","1.5.0-1","1.6.0-1","1.6.1-1","1.6.2-1","1.6.3-1","1.6.4-1","1.6.5-1","1.6.8-1","1.7.0-1","1.7.1-1","1.7.2-1","1.7.3-1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"joserfc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6.2-1","1.6.5-1","1.6.8-1","1.7.0-1","1.7.1-1","1.7.2-1","1.7.4-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"joserfc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.2-1","1.4.0-1","1.4.1-1","1.4.3-1","1.5.0-1","1.6.2-1"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"python-joserfc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.7-1.1"}]}]},{"source":"osv","ecosystem":"openSUSE:Leap 16.0","package":"python-joserfc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.1.0-bp160.5.1"}]}]}],"products":[{"vendor":"authlib","product":"joserfc"}],"references":[{"url":"https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2","tags":["x_refsource_CONFIRM","exploit","advisory","report"]},{"url":"https://github.com/authlib/joserfc/commit/f409f8f058225d7686acab6546c94593e4c1bfbe","tags":["x_refsource_MISC","fix","report"]},{"url":"https://github.com/authlib/joserfc/releases/tag/1.7.4","tags":["x_refsource_MISC","web","report"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102946.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102946","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-102946","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-102946","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-102946","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-102946","tags":["web"]},{"url":"https://bugzilla.suse.com/1285840","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-102946","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.","status":"published","published":"2026-10-15T18:28:06.913Z","modified":"2026-10-15T19:53:09.069Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"cna"}],"cwes":["CWE-290","CWE-345","CWE-347"],"updated_at":"2026-11-02T13:38:43.260938Z"}],"euvd":[{"id":"EUVD-2026-102310","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.","status":"published","published":"2026-10-15T18:28:06Z","modified":"2026-10-15T19:53:09Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-02T17:00:10.305867Z"}],"nvd":[{"id":"CVE-2026-102946","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.","status":"published","published":"2026-10-15T19:17:13.423Z","modified":"2026-10-15T20:17:05.407Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"secondary"}],"cwes":["CWE-290","CWE-345","CWE-347"],"updated_at":"2026-11-02T14:12:59.751798Z"}],"osv":[{"id":"CVE-2026-102946","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.","status":"published","published":"2026-10-15T18:28:06.913Z","modified":"2026-10-28T02:30:39.247786105Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"cwes":["CWE-290","CWE-345","CWE-347"],"updated_at":"2026-11-02T15:44:53.83521Z"},{"id":"DEBIAN-CVE-2026-102946","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.","status":"published","published":"2026-10-15T19:17:13.423Z","modified":"2026-10-17T15:00:08.124237049Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-02T15:45:48.903138Z"},{"id":"UBUNTU-CVE-2026-102946","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.","status":"published","published":"2026-10-15T19:17:00Z","modified":"2026-10-28T17:50:29Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-02T16:55:58.519486Z"},{"id":"openSUSE-SU-2026:12204-1","title":"python313-joserfc-1.7.7-1.1 on GA media","description":"These are all security issues fixed in the python313-joserfc-1.7.7-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-10-20T00:00:00Z","modified":"2026-10-21T17:23:14.150303816Z","updated_at":"2026-11-02T16:58:40.245664Z"},{"id":"openSUSE-SU-2026:22136-1","title":"Security update for python-joserfc","description":"This update for python-joserfc fixes the following issues:\n\nChanges in python-joserfc:\n\n- CVE-2026-102946: JWS signature verification can be bypassed via empty\n  signatures array (bsc#1285840)\n","status":"published","published":"2026-10-19T16:37:12Z","modified":"2026-10-20T19:15:03.948512196Z","updated_at":"2026-11-02T16:58:42.426393Z"}]}}