Is CVE-2026-101917 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-101917?

CVE-2026-101917 has a CVSS v3 severity of MEDIUM (5.3).

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CVE-2026-101917

Description

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.