Insufficient verification of data authenticity in pyjwt - CVE-2026-102275

Vulnerability identifier: #VU151960

CSH Severity: Medium

CVSS v4: 8.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-102275

CWE-ID: CWE-345

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to use a stolen sender-constrained access token without possessing the legitimate holder's private key.

The vulnerability exists due to insufficient verification of data authenticity in OKP private JWK import handling in jwt/algorithms.py when processing a JWK whose x and d values belong to different key pairs. A remote attacker can supply a crafted private OKP JWK to use a stolen sender-constrained access token without possessing the legitimate holder's private key.

Exploitation requires a DPoP verifier that calculates a thumbprint from x, passes the complete JWK to PyJWT for signature verification, and does not reject private JWK parameters.

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 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 Manager Proxy
SUSE Manager Retail Branch Server
SUSE Manager Server
Public Cloud Module
Python 3 Module
openSUSE Leap
openEuler
Ubuntu
python3-jwt (Ubuntu package)
python-jwt-help
python3-jwt
python-jwt
python311-PyJWT

Install security update from vendor's website.

pyjwt - update to 2.15.0
python3-jwt (Ubuntu package) - addressed in versions 2.3.0-1ubuntu0.6, 2.7.0-1ubuntu0.4, 2.10.1-4ubuntu1.3, 2.13.0-1ubuntu1.1
python-jwt-help - addressed in versions 2.3.0-12, 2.8.0-11
python3-jwt - addressed in versions 2.3.0-12, 2.8.0-11
python-jwt - addressed in versions 2.3.0-12, 2.8.0-11
python311-PyJWT - update to 2.8.0-150400.8.20.1

• https://github.com/jpadilla/pyjwt/security/advisories/GHSA-x33g-cr3x-6449
• https://github.com/jpadilla/pyjwt/commit/3cd9ceec33ced359decbad75b413ad668ae6332c

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