CVE-2026-102274
Publication date 28 September 2026
Last updated 27 October 2026
Ubuntu priority
Description
PyJWT is a Python implementation of JSON Web Token standards. From 2.9.0 until 2.14.0, PyJWKSet does not catch the plain ValueError raised for malformed RSA JWK components by RSAAlgorithm.from_jwk in jwt/api_jwk.py. This occurs when a JWK Set contains a malformed RSA key alongside otherwise usable keys. As a result, one malformed member aborts construction of the entire PyJWKSet. Consequently, applications can experience authentication failures or request-level denial of service. 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
5.9 · Medium
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
References
Related Ubuntu Security Notices (USN)
- USN-8934-1
- PyJWT vulnerabilities
- 19 October 2026