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[USN-8133-1] PyJWT vulnerability

Posted on 30 March 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8133-1
March 30, 2026

pyjwt vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

PyJWT could allow unintended access to network services.

Software Description:
- pyjwt: Python 3 implementation of JSON Web Token

Details:

It was discovered that PyJWT did not validate the critical header
parameter, contrary to the RFC specification expectations. A remote
attacker could possibly use this issue to bypass certain authentication
checks and restrictions.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.10
python3-jwt 2.10.1-2ubuntu0.1

Ubuntu 24.04 LTS
python3-jwt 2.7.0-1ubuntu0.1

Ubuntu 22.04 LTS
python3-jwt 2.3.0-1ubuntu0.3

Ubuntu 20.04 LTS
python3-jwt 1.7.1-2ubuntu2.1+esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
python-jwt 1.5.3+ds1-1ubuntu0.1+esm1
Available with Ubuntu Pro
python3-jwt 1.5.3+ds1-1ubuntu0.1+esm1
Available with Ubuntu Pro

Ubuntu 16.04 LTS
python-jwt 1.3.0-1ubuntu0.1+esm1
Available with Ubuntu Pro
python3-jwt 1.3.0-1ubuntu0.1+esm1
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8133-1
CVE-2026-32597

Package Information:
https://launchpad.net/ubuntu/+source/pyjwt/2.10.1-2ubuntu0.1
https://launchpad.net/ubuntu/+source/pyjwt/2.7.0-1ubuntu0.1
https://launchpad.net/ubuntu/+source/pyjwt/2.3.0-1ubuntu0.3

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