{"id":"CVE-2026-102269","summary":"PyJWT: Non-canonical signature segments enable raw-token revocation bypass","details":"PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT signature segment is affected because signature segment decoding accepts characters outside the canonical Base64URL representation. This occurs when non-Base64URL characters are appended to a valid compact JWS signature segment. As a result, base64url_decode produces the same signature bytes for different serialized segments. Consequently, raw-token revocation checks can fail to recognize an equivalent modified token. This issue is fixed in version 2.14.0.","aliases":["GHSA-hxm8-2xgr-2p9m"],"modified":"2026-09-30T03:47:02.632585008Z","published":"2026-09-28T20:27:54.521Z","database_specific":{"cwe_ids":["CWE-180"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102269.json","cna_assigner":"GitHub_M"},"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-2026-102269.json"},{"type":"ADVISORY","url":"https://github.com/jpadilla/pyjwt/security/advisories/GHSA-hxm8-2xgr-2p9m"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102269"},{"type":"FIX","url":"https://github.com/jpadilla/pyjwt/commit/e6f48401001609a8f99e71fcaf355fb895d508a8"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/jpadilla/pyjwt","events":[{"introduced":"0"},{"fixed":"e6f48401001609a8f99e71fcaf355fb895d508a8"},{"fixed":"c6fe464b356ff4b1ebc9ba62172d331a40aa27df"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2.14.0"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["2.13.0","2.12.1","2.12.0","2.11.0","2.10.1","2.10.0","2.9.0","2.8.0","2.7.0","2.6.0","2.5.0","2.4.0","2.3.0","2.2.0","2.1.0","2.0.1","2.0.0","2.0.0a2","2.0.0a1","1.7.1","1.7.0","1.6.4","1.6.3","1.6.1","1.6.0","1.5.3","1.5.2","1.5.1","1.5.0","1.4.2","1.4.1","1.4.0","1.3.0","1.2.0","1.1.0","1.0.1","1.0.0","0.4.3","0.4.2","0.4.1","0.4.0","0.3.2","0.3.1","0.3.0","0.2.3","0.2.2","0.2.0","0.1.9","0.1.6"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-102269.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"}]}