CVE-2026-102274

PyJWT is a Python implementation of JSON Web Token standards. From 2.9.0 until 2.14.0, PyJWKSet does not catch the plain ValueError raised for malformed RSA JWK components by RSAAlgorithm.from_jwk in jwt/api_jwk.py. This occurs when a JWK Set contains a malformed RSA key alongside otherwise usable keys. As a result, one malformed member aborts construction of the entire PyJWKSet. Consequently, applications can experience authentication failures or request-level denial of service. This issue is fixed in version 2.14.0.

• CWE-755

• https://github.com/jpadilla/pyjwt/commit/8915570a0bfda9f0ff0e34e7fb09bdb9d71580cfPatch
• https://github.com/jpadilla/pyjwt/releases/tag/2.14.0Product, Release Notes
• https://github.com/jpadilla/pyjwt/security/advisories/GHSA-w6j9-cwv2-h6wqExploit, Mitigation, Vendor Advisory
• https://github.com/jpadilla/pyjwt/security/advisories/GHSA-w6j9-cwv2-h6wqExploit, Mitigation, Vendor Advisory

Published

Sep 28, 2026

Last Modified

Oct 6, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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