Resource exhaustion in pyjwt - CVE-2026-48525

Vulnerability identifier: #VU132104

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-48525

CWE-ID: CWE-400

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 uncontrolled resource consumption in PyJWS.decode(), PyJWS.decode_complete(), and _load() in jwt/api_jws.py when verifying detached JWS tokens with the unencoded-payload option (b64=false). A remote attacker can send a specially crafted JWS token with an oversized Base64URL payload segment to cause a denial of service.

Practical impact depends on whether upstream components enforce request body-size limits.

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 High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Manager Proxy
SUSE Linux Enterprise Micro
SUSE Linux Micro
Public Cloud Module
Python 3 Module
Basesystem Module
openSUSE Leap
IBM Cloud Pak for Data System
IBM Watson Discovery for IBM Cloud Pak for Data
python3-PyJWT
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
python3-PyJWT - update to 2.4.0-150200.3.14.1
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-w7vc-732c-9m39

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