{"id":"CVE-2026-102265","published":"2026-09-28T21:17:14.077","lastModified":"2026-09-28T21:17:14.077","description":"PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, PyJWS._load in jwt/api_jws.py is affected because parser catches ValueError but not RecursionError. This occurs when a deeply nested token header reaches json.loads. As a result, RecursionError escapes the documented PyJWT error hierarchy. Consequently, an unauthenticated malformed token can cause a request-level failure and HTTP 500. This issue is fixed in version 2.14.0.","cvssScore":5.3,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cwes":["CWE-674"],"vendors":[],"products":[],"references":[{"url":"https://github.com/jpadilla/pyjwt/commit/06573692ebcdec8831c3927513b3e87c31fbbb62","tags":[]},{"url":"https://github.com/jpadilla/pyjwt/releases/tag/2.14.0","tags":[]},{"url":"https://github.com/jpadilla/pyjwt/security/advisories/GHSA-8wjv-2p76-3863","tags":[]}],"exploitRefs":[{"url":"https://github.com/jpadilla/pyjwt/commit/06573692ebcdec8831c3927513b3e87c31fbbb62","tags":[]},{"url":"https://github.com/jpadilla/pyjwt/releases/tag/2.14.0","tags":[]},{"url":"https://github.com/jpadilla/pyjwt/security/advisories/GHSA-8wjv-2p76-3863","tags":[]}],"hasPoc":true,"ai":null}