Debian dla-4747 : python3-httplib2 - security update

high Nessus Plugin ID 338429

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-4747 advisory.

------------------------------------------------------------------------- Debian LTS Advisory DLA-4747-1 [email protected] https://www.debian.org/lts/security/ Emmanuel Arias August 20, 2026 https://wiki.debian.org/LTS
-------------------------------------------------------------------------

Package : python-httplib2 Version : 0.18.1-3+deb11u1 CVE ID : CVE-2021-21240 CVE-2026-59939 Debian Bug : 982738

Two vulnerabilities were discovered in python-httplib2, a comprehensive Python HTTP client library:

CVE-2021-21240

A malicious server which responds with long series of '\xa0' characters in the 'www-authenticate' header may cause Denial of Service (CPU burn while parsing header) of the httplib2 client accessing said server

CVE-2026-59939

Unbounded decompression of HTTP response bodies encoded with gzip or deflate Content-Encoding could result in denial of service.

For Debian 11 bullseye, these problems have been fixed in version 0.18.1-3+deb11u1.

We recommend that you upgrade your python-httplib2 package.

For the detailed security status of python-httplib2 please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/python-httplib2

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-httplib2 packages.

Plugin Details

Severity: High

ID: 338429

File Name: debian_DLA-4747.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 8/20/2026

Updated: 8/20/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.18

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

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

CVSS Score Source: CVE-2021-21240

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-httplib2

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: 8/20/2026

Vulnerability Publication Date: 2/8/2021

Reference Information

CVE: CVE-2021-21240, CVE-2026-59939

Detections

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