lxml is a library for processing XML and HTML in the Python language. Prior to 6.1.1, link attributes in ``lxml.html.defs.link_attrs`` were missing ``xlink:href``, which can be used for URL bypass attacks in embedded SVG/MathML/etc. content. This vulnerability was fixed in lxml 6.1.1 and lxml_html_clean 0.4.5.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-104952 advisory.

    lxml is a library for processing XML and HTML in the Python language. Prior to 6.1.1, link attributes in     ``lxml.html.defs.link_attrs`` were missing ``xlink:href``, which can be used for URL bypass attacks in     embedded SVG/MathML/etc. content. This vulnerability was fixed in lxml 6.1.1 and lxml_html_clean 0.4.5.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - lxml is a library for processing XML and HTML in the Python language. Prior to 6.1.1, link attributes in     ``lxml.html.defs.link_attrs`` were missing ``xlink:href``, which can be used for URL bypass attacks in     embedded SVG/MathML/etc. content. This vulnerability was fixed in lxml 6.1.1 and lxml_html_clean 0.4.5.
    (CVE-2026-49825)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - lxml is a library for processing XML and HTML in the Python language. Prior to 6.1.1, link attributes in
    ``lxml.html.defs.link_attrs`` were missing ``xlink:href``, which can be used for URL bypass attacks in
    embedded SVG/MathML/etc. content. This vulnerability was fixed in lxml 6.1.1 and lxml_html_clean 0.4.5.
    (CVE-2026-49825)

ID	Name	Product	Family	Type	Severity
341409	Unity Linux 20.1070e Security Update: python-lxml (UTSA-2026-104952)	Nessus	Unity Linux Local Security Checks	Local	high
338704	Linux Distros Unpatched Vulnerability : CVE-2026-49825	Nessus	Misc.	Local	high
444534	SCA: security update for lxml_html_clean (GHSA-4jhm-jv67-739f)	Tenable Cloud Security	SCA Checks	Local	high
444534	SCA: security update for lxml_html_clean (GHSA-4jhm-jv67-739f)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

Detections

Analytics

CVE-2026-49825

high

Tenable Plugins

high

high

high

high