Debian dla-4799 : python-lxml-doc - security update

high Nessus Plugin ID 350955

Synopsis

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

Description

The remote Debian 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4799 advisory.

------------------------------------------------------------------------- Debian LTS Advisory DLA-4799-1 [email protected] https://www.debian.org/lts/security/ Guilhem Moulin September 28, 2026 https://wiki.debian.org/LTS
-------------------------------------------------------------------------

Package : lxml Version : 4.9.2-1+deb12u1 CVE ID : CVE-2026-28348 CVE-2026-28350 CVE-2026-41066 CVE-2026-49825

Multiple vulnerabilities were discovered in lxml, a set pythonic binding for the libxml2 and libxslt libraries, which may lead to information disclosure or privilege escalation.

CVE-2026-28348

The CSS @import filter is prone to bypass via unicode escapes.

CVE-2026-28350

The default `Cleaner` configuration is prone to <base> tag injection, thereby allowing an attacker to hijack relative links on the page.

CVE-2026-41066

Qiu Sihao discovered that the default configuration of iterparse() and ETCompatXMLParser() allows XML External Entity attacks to local files, which may lead to information disclosure.

CVE-2026-49825

Guillem Lefait discovered that the Cleaner module fails to strip `javascript:` URLs from namespaced URL attributes (xlink:href).

For Debian 12 bookworm, these problems have been fixed in version 4.9.2-1+deb12u1.

We recommend that you upgrade your lxml packages.

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

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 python-lxml-doc packages.

Plugin Details

Severity: High

ID: 350955

File Name: debian_DLA-4799.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 9/29/2026

Updated: 9/29/2026

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: Medium

Score: 5

Percentile: 94.15

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.7

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

CVSS Score Source: CVE-2026-49825

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.4

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

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:12.0, p-cpe:/a:debian:debian_linux:python-lxml-doc, p-cpe:/a:debian:debian_linux:python3-lxml

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: 9/28/2026

Vulnerability Publication Date: 3/2/2026

Reference Information

CVE: CVE-2026-28348, CVE-2026-28350, CVE-2026-41066, CVE-2026-49825

Detections

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