CVE-2026-101917

PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT get_signing_key_from_jwt is affected because unknown kid misses force refreshes without a negative cache or minimum refresh interval. This occurs when unauthenticated tokens repeatedly use the same unknown kid or varying kid values absent from the cached JWKS. As a result, each cache miss causes PyJWKClient to refresh the JWKS. Consequently, attacker traffic can amplify outbound requests to the configured JWKS endpoint. This issue is fixed in version 2.14.0.

• CWE-770

• https://github.com/jpadilla/pyjwt/commit/ba4853a75fb9676362da17f67d0f64bd18afd4e1Patch
• https://github.com/jpadilla/pyjwt/releases/tag/2.14.0Product, Release Notes
• https://github.com/jpadilla/pyjwt/security/advisories/GHSA-2gx3-rcp4-g85qExploit, Vendor Advisory
• https://github.com/jpadilla/pyjwt/security/advisories/GHSA-2gx3-rcp4-g85qExploit, Vendor Advisory

Published

Sep 28, 2026

Last Modified

Oct 7, 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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