CVE-2026-101917
Publication date 28 September 2026
Last updated 27 October 2026
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| pyjwt | 26.10 stonking |
Fixed in 2.13.0-1ubuntu1.1
|
| 26.04 LTS resolute |
Fixed in 2.10.1-4ubuntu1.3
|
|
| 24.04 LTS noble |
Fixed in 2.7.0-1ubuntu0.4
|
|
| 22.04 LTS jammy |
Fixed in 2.3.0-1ubuntu0.6
|
|
| 20.04 LTS focal |
Not affected
|
|
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial |
Not affected
|
Severity score breakdown
CVSS version: CVSS v3.0
Base score
5.3 · Medium
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
References
Related Ubuntu Security Notices (USN)
- USN-8934-1
- PyJWT vulnerabilities
- 19 October 2026