lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.4, the _has_sneaky_javascript() method strips backslashes before checking for dangerous CSS keywords. This causes CSS Unicode escape sequences to bypass the @import and expression() filters, allowing external CSS loading or XSS in older browsers. This issue has been patched in version 0.4.4.

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                debian-lts@lists.debian.org     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.

The remote openSUSE 16 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:20345-1 advisory.

    Changes in python-lxml_html_clean:

    - CVE-2026-28348: improper keywords checking can allow external CSS loading (bsc#1259378)
    - CVE-2026-28350: lack of base tag handling can allow the hijacking of the resolution of relative URLs     (bsc#1259379)

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

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

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-f46fc594f3 advisory.

    Security update for python-lxml-html-clean


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

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

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-154efc6066 advisory.

    Security update for python-lxml-html-clean


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

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

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-fdded962b2 advisory.

    Security update for python-lxml-html-clean


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

Note that Nessus has not tested for these issues 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_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to     version 0.4.4, the _has_sneaky_javascript() method strips backslashes before checking for dangerous CSS     keywords. This causes CSS Unicode escape sequences to bypass the @import and expression() filters,     allowing external CSS loading or XSS in older browsers. This issue has been patched in version 0.4.4.
    (CVE-2026-28348)

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_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to
    version 0.4.4, the _has_sneaky_javascript() method strips backslashes before checking for dangerous CSS
    keywords. This causes CSS Unicode escape sequences to bypass the @import and expression() filters,
    allowing external CSS loading or XSS in older browsers. This issue has been patched in version 0.4.4.
    (CVE-2026-28348)

ID	Name	Product	Family	Type	Severity
350955	Debian dla-4799 : python-lxml-doc - security update	Nessus	Debian Local Security Checks	Local	high
302092	openSUSE 16 Security Update : python-lxml_html_clean (openSUSE-SU-2026:20345-1)	Nessus	SuSE Local Security Checks	Local	medium
301918	Fedora 44 : python-lxml-html-clean (2026-f46fc594f3)	Nessus	Fedora Local Security Checks	Local	medium
301914	Fedora 42 : python-lxml-html-clean (2026-154efc6066)	Nessus	Fedora Local Security Checks	Local	medium
301913	Fedora 43 : python-lxml-html-clean (2026-fdded962b2)	Nessus	Fedora Local Security Checks	Local	medium
301397	Linux Distros Unpatched Vulnerability : CVE-2026-28348	Nessus	Misc.	Local	medium
438332	SCA: security update for lxml-html-clean (GHSA-hw26-mmpg-fqfg)	Tenable Cloud Security	SCA Checks	Local	medium
438332	SCA: security update for lxml-html-clean (GHSA-hw26-mmpg-fqfg)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium

Detections

Analytics

CVE-2026-28348

medium

Tenable Plugins

high

medium

medium

medium

medium

medium

medium

medium