CVE-2026-101917
MEDIUMCVSS 5.3Description
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.
Timeline
Published:September 28th, 2026 9:17 PM
Last modified:October 7th, 2026 9:01 PM
CVSS Scoring
CVSS v3: 5.3 (MEDIUM)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected Software
From NVD CPE configuration data
Vendors
pyjwt_project
Products
pyjwt
Weaknesses (CWE)
References & Reports
Advisories, patches, and third-party reports
- https://github.com/jpadilla/pyjwt/commit/ba4853a75fb9676362da17f67d0f64bd18afd4e1Patch
- https://github.com/jpadilla/pyjwt/releases/tag/2.14.0Product
- https://github.com/jpadilla/pyjwt/security/advisories/GHSA-2gx3-rcp4-g85qExploit
- https://github.com/jpadilla/pyjwt/security/advisories/GHSA-2gx3-rcp4-g85qExploit
Source: NIST NVD · Data may lag official sources by up to one minute