CVE-2026-101917: Pyjwt Project Pyjwt

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

Published 2026-09-28. Last modified 2026-10-07.