{"id":"CVE-2026-102265","summary":"PyJWT: Uncaught RecursionError in jwt.decode() on deeply nested token header","details":"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.","aliases":["GHSA-8wjv-2p76-3863"],"modified":"2026-09-30T03:47:04.577889970Z","published":"2026-09-28T20:48:04.664Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-674"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102265.json"},"references":[{"type":"WEB","url":"https://github.com/jpadilla/pyjwt/releases/tag/2.14.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102265.json"},{"type":"ADVISORY","url":"https://github.com/jpadilla/pyjwt/security/advisories/GHSA-8wjv-2p76-3863"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102265"},{"type":"FIX","url":"https://github.com/jpadilla/pyjwt/commit/06573692ebcdec8831c3927513b3e87c31fbbb62"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/jpadilla/pyjwt","events":[{"introduced":"7144e4534c34810f4525dc4578a32addd8212cff"},{"fixed":"06573692ebcdec8831c3927513b3e87c31fbbb62"},{"fixed":"c6fe464b356ff4b1ebc9ba62172d331a40aa27df"}],"database_specific":{"extracted_events":[{"introduced":"2.13.0"},{"fixed":"2.14.0"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["2.13.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-102265.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:N/I:N/A:L"}]}