Bug 2542677 (CVE-2026-101917) - CVE-2026-101917 pyjwt: PyJWT: Denial of Service via outbound request amplification on unknown key identifiers
Summary: CVE-2026-101917 pyjwt: PyJWT: Denial of Service via outbound request amplific...
Keywords:
Status: NEW
Alias: CVE-2026-101917
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-28 20:33 UTC by OSIDB Bzimport
Modified: 2026-11-03 08:30 UTC (History)
110 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-09-28 20:33:17 UTC 
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.
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