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ESB-2026.3119 PUBLISHED CVSS 7.5 HIGH

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.3119 USN-8133-1: PyJWT vulnerability 31 March 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: PyJWT Publisher: Ubuntu Operating System: Ubuntu Resolution: Patch/Upgrade CVE Names: CVE-2026-32597 Original Bulletin: https://ubuntu.com/security/notices/USN-8133-1 Comment: CVSS (Max): 7.5 CVE-2026-32597 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N) CVSS Source: Ubuntu Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N EPSS (Max): 0.0% (0th) CVE-2026-32597 2026-03-30 - --------------------------BEGIN INCLUDED TEXT-------------------- USN-8133-1: PyJWT vulnerability Publication date 30 March 2026 Overview PyJWT could allow unintended access to network services. Releases 25.10 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS 16.04 LTS --------------------------------------------------------------------------------- Open side navigation Packages o 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 Package Version Release 25.10 python3-jwt - 2.10.1-2ubuntu0.1 questing 24.04 LTS python3-jwt - 2.7.0-1ubuntu0.1 noble 22.04 LTS python3-jwt - 2.3.0-1ubuntu0.3 jammy 20.04 LTS python3-jwt - 1.7.1-2ubuntu2.1+esm1 Ubuntu Pro Fix available with focal Ubuntu Pro . python-jwt - 1.5.3+ds1-1ubuntu0.1+esm1 Ubuntu Pro Fix available 18.04 LTS with Ubuntu Pro . bionic python3-jwt - 1.5.3+ds1-1ubuntu0.1+esm1 Ubuntu Pro Fix available with Ubuntu Pro . python-jwt - 1.3.0-1ubuntu0.1+esm1 Ubuntu Pro Fix available with 16.04 LTS Ubuntu Pro . xenial python3-jwt - 1.3.0-1ubuntu0.1+esm1 Ubuntu Pro Fix available with Ubuntu Pro . --------------------------------------------------------------------------------- References o CVE-2026-32597 - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AUSCERT's members. As AUSCERT did not write the document quoted above, AUSCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AUSCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://portal.auscert.org.au/bulletins/ =========================================================================== AUSCERT The University of Queensland, Brisbane QLD 4072 Australia e: auscert@auscert.org.au t: +61 (0)7 3365 4417 Allies in Cyber Security ===========================================================================

Risk Scores

CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected Products

VendorProductVersions
UbuntuPyJWT

Timeline

References

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