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Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS / 26.10 : PyJWT vulnerabilities (USN-8934-1)

medium Nessus Plugin ID 369329

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Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS / 26.10 host has packages installed that are affected by a vulnerability as referenced in the USN-8934-1 advisory.

 Kingsley Olukanni discovered that PyJWT did not properly handle unknown key identifiers when retrieving signing keys. An attacker could possibly use this issue to amplify requests to the configured key endpoint, resulting in a denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS and Ubuntu 26.10. (CVE-2026-101917)

 Ekalabya Ghosh discovered that PyJWT did not properly handle certain recursively nested JSON payloads. An attacker could possibly use this issue to cause an application to fail, resulting in a denial of service.
 (CVE-2026-101918)

 Pedram Hayati discovered that PyJWT did not properly handle malformed RSA keys in a JSON Web Key Set. An attacker could possibly use this issue to cause authentication failures or a denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS,

 Ubuntu 26.04 LTS and Ubuntu 26.10. (CVE-2026-102274)

 It was discovered that PyJWT did not properly validate certain OKP private key components. An attacker could possibly use this issue to confuse the identity of public and private keys, and use a stolen sender- constrained token without the legitimate private key. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS and Ubuntu 26.10. (CVE-2026-102275)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected python-jwt and / or python3-jwt packages.

See Also

https://ubuntu.com/security/notices/USN-8934-1

Plugin Details

Severity: Medium

ID: 369329

File Name: ubuntu_USN-8934-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 10/21/2026

Updated: 10/21/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.10, p-cpe:/a:canonical:ubuntu_linux:python-jwt, p-cpe:/a:canonical:ubuntu_linux:python3-jwt

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Ease: No known exploits are available

Patch Publication Date: 10/19/2026

Vulnerability Publication Date: 10/19/2026

Reference Information

USN: 8934-1