Debian dla-4564 : python3-jwt - security update

high Nessus Plugin ID 312261

Synopsis

The remote Debian host is missing a security-related update.

Description

The remote Debian 11 host has a package installed that is affected by a vulnerability as referenced in the dla-4564 advisory.

------------------------------------------------------------------------- Debian LTS Advisory DLA-4564-1 [email protected] https://www.debian.org/lts/security/ Jochen Sprickerhof May 05, 2026 https://wiki.debian.org/LTS
-------------------------------------------------------------------------

Package : pyjwt Version : 1.7.1-2+deb11u1 CVE ID : CVE-2026-32597

It was discovered that PyJWT, a Python implementation of JSON Web Token did not validate the crit (Critical) Header Parameter defined in RFC 7515 4.1.11. When a JWS token contains a crit array listing extensions that PyJWT does not understand, the library accepts the token instead of rejecting it.
This violates the MUST requirement in the RFC.

For Debian 11 bullseye, this problem has been fixed in version 1.7.1-2+deb11u1.

We recommend that you upgrade your pyjwt packages.

For the detailed security status of pyjwt please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/pyjwt

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS Attachment:
signature.asc Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian 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

Upgrade the python3-jwt packages.

Plugin Details

Severity: High

ID: 312261

File Name: debian_DLA-4564.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 5/5/2026

Updated: 5/5/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.1

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:C/A:N

CVSS Score Source: CVE-2026-32597

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:python3-jwt

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/5/2026

Vulnerability Publication Date: 3/12/2026

Reference Information

CVE: CVE-2026-32597

Detections

Analytics