Server-Side Request Forgery (SSRF) in pyjwt - CVE-2026-102267

Vulnerability identifier: #VU150527

CSH Severity: Medium

CVSS v4: 9.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-102267

CWE-ID: CWE-918

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to disclose sensitive request headers and cause forged JWT acceptance.

The vulnerability exists due to improper validation of redirect destinations in PyJWKClient when fetching JWKS from an attacker-influenced configured endpoint. A remote attacker can cause the endpoint to return a redirect to a different host to disclose sensitive request headers and cause forged JWT acceptance.

A token kid alone does not trigger the issue.

pyjwt
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Desktop 15
SUSE Manager Server
SUSE Manager Proxy
SUSE Manager Retail Branch Server
Public Cloud Module
Python 3 Module
openSUSE Leap
Ubuntu
openEuler
python3-jwt (Ubuntu package)
python-jwt (Ubuntu package)
python-jwt
python-jwt-help
python3-jwt
python311-PyJWT

Install security update from vendor's website.

pyjwt - update to 2.14.0
python3-jwt (Ubuntu package) - addressed in versions 1.3.0-1ubuntu0.1+esm3, 1.5.3+ds1-1ubuntu0.1+esm3, 1.7.1-2ubuntu2.1+esm3, 2.3.0-1ubuntu0.5, 2.7.0-1ubuntu0.3, 2.10.1-4ubuntu1.2
python-jwt (Ubuntu package) - addressed in versions 1.3.0-1ubuntu0.1+esm3, 1.5.3+ds1-1ubuntu0.1+esm3
python-jwt - addressed in versions 2.3.0-8, 2.8.0-6
python-jwt-help - addressed in versions 2.3.0-8, 2.8.0-6
python3-jwt - addressed in versions 2.3.0-8, 2.8.0-6
python311-PyJWT - update to 2.8.0-150400.8.20.1

• https://github.com/jpadilla/pyjwt/security/advisories/GHSA-9v7f-9g4p-ffgj
• https://github.com/jpadilla/pyjwt/commit/0a795b8e1f6ef08f634aa7086fc41cc6d5ce3e56

• Multiple vulnerabilities in pyjwt
• openEuler 24.03 LTS SP1 update for python-jwt
• openEuler 22.03 LTS SP4 update for python-jwt
• openEuler 24.03 LTS SP4 update for python-jwt
• openEuler 24.03 LTS SP3 update for python-jwt
• Ubuntu update for pyjwt
• SUSE update for python-PyJWT