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Debian dla-4446 : python3-urllib3 - security update

high Nessus Plugin ID 296257

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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-4446 advisory.

 ------------------------------------------------------------------------- Debian LTS Advisory DLA-4446-1 [email protected] https://www.debian.org/lts/security/ Guilhem Moulin January 23, 2026 https://wiki.debian.org/LTS
 -------------------------------------------------------------------------

 Package : python-urllib3 Version : 1.26.5-1~exp1+deb11u3 CVE ID : CVE-2026-21441 Debian Bug : 1125062

 It was discovered that python-urllib3, an HTTP library with thread-safe connection pooling for Python, was vulnerable to decompression bomb when following HTTP redirects via the streaming API, which could lead to Denial of Service.

 For Debian 11 bullseye, this problem has been fixed in version 1.26.5-1~exp1+deb11u3.

 We recommend that you upgrade your python-urllib3 packages.

 For the detailed security status of python-urllib3 please refer to its security tracker page at:
 https://security-tracker.debian.org/tracker/python-urllib3

 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-urllib3 packages.

See Also

http://www.nessus.org/u?eb907009

https://security-tracker.debian.org/tracker/CVE-2026-21441

https://packages.debian.org/source/bullseye/python-urllib3

Plugin Details

Severity: High

ID: 296257

File Name: debian_DLA-4446.nasl

Version: 1.1

Type: local

Agent: unix

Published: 1/23/2026

Updated: 1/23/2026

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: 5.8

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

CVSS Score Source: CVE-2026-21441

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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:U/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 8.9

Threat Score: 6.3

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:python3-urllib3

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

Exploit Ease: No known exploits are available

Patch Publication Date: 1/23/2026

Vulnerability Publication Date: 1/7/2026

Reference Information

CVE: CVE-2026-21441