{"cve":"CVE-2026-102265","nvd":{"published":"2026-09-28T21:17:14.077","modified":"2026-10-07T20:57:14.290","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3},"cwes":["CWE-674"],"references":["https://github.com/jpadilla/pyjwt/commit/06573692ebcdec8831c3927513b3e87c31fbbb62","https://github.com/jpadilla/pyjwt/releases/tag/2.14.0","https://github.com/jpadilla/pyjwt/security/advisories/GHSA-8wjv-2p76-3863","https://github.com/jpadilla/pyjwt/security/advisories/GHSA-8wjv-2p76-3863"],"products":["pyjwt_project:pyjwt"],"source":"nvd","synced_at":"2026-10-19T22:56:48.555445741+00:00"},"epss":{"cve":"CVE-2026-102265","score":0.00343,"percentile":0.27563,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-8wjv-2p76-3863","url":"https://osv.dev/vulnerability/GHSA-8wjv-2p76-3863","summary":"PyJWT: Uncaught RecursionError in jwt.decode() on deeply nested token header","modified":"2026-10-01T17:55:45.157085612Z","packages":[{"ecosystem":"PyPI","name":"pyjwt","purl":"pkg:pypi/pyjwt","ranges":[">=2.13.0 <2.14.0"],"fixed":["2.14.0"]}]},{"id":"PYSEC-2026-4142","url":"https://osv.dev/vulnerability/PYSEC-2026-4142","summary":"PyJWT: Uncaught RecursionError in jwt.decode() on deeply nested token header","modified":"2026-10-01T17:45:17.076153628Z","packages":[{"ecosystem":"PyPI","name":"pyjwt","purl":"pkg:pypi/pyjwt","ranges":[">=2.13.0 <2.14.0"],"fixed":["2.14.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}