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Debian dla-4421 : python3-urllib3 - security update

high Nessus Plugin ID 280071

Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 11 host has a package installed that is affected by multiple vulnerabilities as referenced in the dla-4421 advisory.

 ------------------------------------------------------------------------- Debian LTS Advisory DLA-4421-1 [email protected] https://www.debian.org/lts/security/ Guilhem Moulin December 26, 2025 https://wiki.debian.org/LTS
 -------------------------------------------------------------------------

 Package : python-urllib3 Version : 1.26.5-1~exp1+deb11u2 CVE ID : CVE-2025-50181 CVE-2025-66418 Debian Bug : 1108076 1122030

 Vulnerabilities were found in python-urllib3, an HTTP library with thread-safe connection pooling for Python, which could lead to denial of service or request forgery.

 CVE-2025-50181

 Redirects were not disabled when retries are disabled on PoolManager instantiation. An application attempting to mitigate SSRF or open redirect vulnerabilities by disabling redirects at the PoolManager level remained vulnerable.

 CVE-2025-66418

 The number of links in the decompression chain was unbounded, allowing a malicious server to insert a virtually unlimited number of compression steps which could lead to denial of service.

 For Debian 11 bullseye, these problems have been fixed in version 1.26.5-1~exp1+deb11u2.

 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 these issues 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-2025-50181

https://security-tracker.debian.org/tracker/CVE-2025-66418

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

Plugin Details

Severity: High

ID: 280071

File Name: debian_DLA-4421.nasl

Version: 1.1

Type: local

Agent: unix

Published: 12/26/2025

Updated: 12/26/2025

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: Medium

Base Score: 6.4

Temporal Score: 5

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

CVSS Score Source: CVE-2025-50181

CVSS v3

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 5.5

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

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

CVSS v4

Risk Factor: High

Base Score: 8.9

Threat Score: 7.7

Threat Vector: CVSS:4.0/E:P

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

CVSS Score Source: CVE-2025-66418

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 Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 12/26/2025

Vulnerability Publication Date: 6/18/2025

Reference Information

CVE: CVE-2025-50181, CVE-2025-66418