CVE-2026-101918
Publication date 28 September 2026
Last updated 27 October 2026
Ubuntu priority
Description
PyJWT is a Python implementation of JSON Web Token standards. From 2.0.0a1 until 2.15.0, PyJWT PyJWKClient.get_signing_key_from_jwt is affected because payload parser catches ValueError but not RecursionError. This occurs when an attacker-controlled recursively nested payload reaches json.loads. As a result, documented PyJWT exception handling does not contain the failure. Consequently, an unauthenticated request can raise an exception that may produce an HTTP 500 response. The advisory-defined affected implementation also includes jwt/api_jwt.py, verify_signature=False. This issue is fixed in version 2.15.0.
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 |
Fixed in 1.7.1-2ubuntu2.1+esm4
|
|
| 18.04 LTS bionic |
Fixed in 1.5.3+ds1-1ubuntu0.1+esm4
|
|
| 16.04 LTS xenial |
Fixed in 1.3.0-1ubuntu0.1+esm4
|
Get expanded security coverage with Ubuntu Pro
Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.
Get Ubuntu Pro 30-day free trialSeverity 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