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Debian dla-4418 : python3-mechanize - security update

high Nessus Plugin ID 279499

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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-4418 advisory.

 ------------------------------------------------------------------------- Debian LTS Advisory DLA-4418-1 [email protected] https://www.debian.org/lts/security/ Daniel Leidert December 22, 2025 https://wiki.debian.org/LTS
 -------------------------------------------------------------------------

 Package : python-mechanize Version : 1:0.4.5-2+deb11u1 CVE ID : CVE-2021-32837

 Erik Krogh Kristensen and Rasmus Petersen from the GitHub Security Lab discovered a ReDoS (Regular Expression Denial of Service) vulnerability in python-mechanize, a library to automate interaction with websites modeled after the Perl module WWW::Mechanize, which could lead to Denial of Service when parsing a malformed authentication header.

 For Debian 11 bullseye, this problem has been fixed in version 1:0.4.5-2+deb11u1.

 We recommend that you upgrade your python-mechanize packages.

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

 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: This is a digitally signed message part

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-mechanize packages.

See Also

http://www.nessus.org/u?a6424ad8

https://security-tracker.debian.org/tracker/CVE-2021-32837

https://packages.debian.org/source/bullseye/python-mechanize

Plugin Details

Severity: High

ID: 279499

File Name: debian_DLA-4418.nasl

Version: 1.1

Type: local

Agent: unix

Published: 12/22/2025

Updated: 12/22/2025

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, 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:N/A:C

CVSS Score Source: CVE-2021-32837

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:N/A:H

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

CVSS v4

Risk Factor: High

Base Score: 8.7

Threat Score: 7.7

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

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

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: 12/22/2025

Vulnerability Publication Date: 1/17/2023

Reference Information

CVE: CVE-2021-32837