CVE-2026-102265

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.

• CWE-674

• https://github.com/jpadilla/pyjwt/commit/06573692ebcdec8831c3927513b3e87c31fbbb62Patch
• https://github.com/jpadilla/pyjwt/releases/tag/2.14.0Product, Release Notes
• https://github.com/jpadilla/pyjwt/security/advisories/GHSA-8wjv-2p76-3863Exploit, Mitigation, Vendor Advisory
• https://github.com/jpadilla/pyjwt/security/advisories/GHSA-8wjv-2p76-3863Exploit, Mitigation, Vendor Advisory

Published

Sep 28, 2026

Last Modified

Oct 7, 2026

Status

Analyzed

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