Improper Cleanup on Thrown Exception in pyjwt - CVE-2026-48524

Vulnerability identifier: #VU132103

CSH Severity: Low

CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-48524

CWE-ID: CWE-460

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper cleanup on thrown exception in PyJWKClient.get_signing_key() and fetch_data() when processing JWTs with attacker-controlled unknown kid values and JWKS fetch failures. A remote attacker can send JWTs with unknown kid values to cause a denial of service.

The issue can reduce authentication availability until the next successful JWKS fetch, and the outcome depends on upstream JWKS endpoint behavior such as rate limiting or transient errors.

pyjwt
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Desktop 15
SUSE Manager Proxy
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE Linux Micro
Public Cloud Module
Python 3 Module
openSUSE Leap
IBM Cloud Pak for Data System
IBM Watson Discovery for IBM Cloud Pak for Data
python311-PyJWT

Install security update from vendor's website.

pyjwt - update to 2.13.0
IBM Cloud Pak for Data System - update to 8.10.26.06.SP2
IBM Watson Discovery for IBM Cloud Pak for Data - update to 5.3.2
python311-PyJWT - addressed in versions 2.8.0-150400.8.13.1, 2.12.1-slfo.1.1_2.1

• https://github.com/jpadilla/pyjwt/security/advisories/GHSA-fhv5-28vv-h8m8

• Multiple vulnerabilities in pyjwt
• SUSE update for python-PyJWT
• Multiple vulnerabilities in IBM Watson Discovery Cartridge
• SUSE update for python-PyJWT
• Multiple vulnerabilities in IBM Cloud Pak for Data System