CVE-2026-101917
Medium
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.
SeverityMedium
CVSS5.3
Exploit probability—
ProductPyjwt
PublishedSep 28, 2026
First seenSep 28, 2026
Weakness typeCWE-770Allocation of resources without limits
How to fix
Update
- pyjwt_project pyjwt2.14.0 or later
- pyjwt2.14.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pyjwt_project pyjwt | v < 2.14.0 | 2.14.0 |
| pyjwtPyPI | v < 2.14.0 | 2.14.0 |
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