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 version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2026:1016 advisory.

    Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:

    CVE-2026-49825:
    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. Fixed in lxml 6.1.1 and lxml_html_clean 0.4.5.

Tenable has extracted the preceding description block directly from the Tencent 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 remote Oracle Linux 8 host has a package installed that is affected by a vulnerability as referenced in the ELSA-2026-67943 advisory.

    - Security fix for CVE-2026-49825: missing xlink:href in known HTML       link attributes     Resolves: RHEL-251508
    - Security fix for CVE-2021-43818     Resolves: rhbz#2032569
    - Security fix for CVE-2021-28957     Resolves: rhbz#1941534
    - Security fix for CVE-2020-27783: mXSS due to the use of improper parser     Resolves: rhbz#1901633

Tenable has extracted the preceding description block directly from the Oracle 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 remote MiracleLinux 8 host has a package installed that is affected by a vulnerability as referenced in the AXSA:2026-1874:02 advisory.

    * lxml: lxml-html-clean: lxml: URL bypass vulnerability in Cleaner via missing xlink:href (CVE-2026-49825)

Tenable has extracted the preceding description block directly from the MiracleLinux 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 remote AlmaLinux 8 host has a package installed that is affected by a vulnerability as referenced in the ALSA-2026:67943 advisory.

    * lxml: lxml-html-clean: lxml: URL bypass vulnerability in Cleaner via missing xlink:href (CVE-2026-49825)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 remote RockyLinux 8 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2026:67943 advisory.

    * lxml: lxml-html-clean: lxml: URL bypass vulnerability in Cleaner via missing xlink:href (CVE-2026-49825)

Tenable has extracted the preceding description block directly from the RockyLinux 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 remote Redhat Enterprise Linux 8 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2026:67943 advisory.

    Python is an interpreted, interactive, object-oriented programming language, which includes modules,     classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to     many system calls and libraries, as well as to various windowing systems.

    Security Fix(es):

    * lxml: lxml-html-clean: lxml: URL bypass vulnerability in Cleaner via missing xlink:href (CVE-2026-49825)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 remote Redhat Enterprise Linux 9 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2026:67324 advisory.

    Python is an interpreted, interactive, object-oriented programming language, which includes modules,     classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to     many system calls and libraries, as well as to various windowing systems.

    Security Fix(es):

    * lxml: lxml-html-clean: lxml: URL bypass vulnerability in Cleaner via missing xlink:href (CVE-2026-49825)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 remote Redhat Enterprise Linux 9 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2026:67326 advisory.

    Python is an interpreted, interactive, object-oriented programming language, which includes modules,     classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to     many system calls and libraries, as well as to various windowing systems.

    Security Fix(es):

    * lxml: lxml-html-clean: lxml: URL bypass vulnerability in Cleaner via missing xlink:href (CVE-2026-49825)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 remote Redhat Enterprise Linux 9 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2026:67325 advisory.

    Python is an interpreted, interactive, object-oriented programming language, which includes modules,     classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to     many system calls and libraries, as well as to various windowing systems.

    Security Fix(es):

    * lxml: lxml-html-clean: lxml: URL bypass vulnerability in Cleaner via missing xlink:href (CVE-2026-49825)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 remote MiracleLinux 9 host has a package installed that is affected by a vulnerability as referenced in the AXSA:2026-1823:01 advisory.

    * lxml: lxml-html-clean: lxml: URL bypass vulnerability in Cleaner via missing xlink:href (CVE-2026-49825)

Tenable has extracted the preceding description block directly from the MiracleLinux 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 remote RockyLinux 9 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2026:66204 advisory.

    * lxml: lxml-html-clean: lxml: URL bypass vulnerability in Cleaner via missing xlink:href (CVE-2026-49825)

Tenable has extracted the preceding description block directly from the RockyLinux 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 remote RockyLinux 9 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2026:66203 advisory.

    * lxml: lxml-html-clean: lxml: URL bypass vulnerability in Cleaner via missing xlink:href (CVE-2026-49825)

Tenable has extracted the preceding description block directly from the RockyLinux 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 remote Oracle Linux 9 host has a package installed that is affected by a vulnerability as referenced in the ELSA-2026-662030 advisory.

    [4.9.3-2.1]
    - Fix CVE-2026-49825: add xlink:href to known HTML link attributes     Resolves: RHEL-251488

Tenable has extracted the preceding description block directly from the Oracle 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 remote MiracleLinux 9 host has a package installed that is affected by a vulnerability as referenced in the AXSA:2026-1813:01 advisory.

    * lxml: lxml-html-clean: lxml: URL bypass vulnerability in Cleaner via missing xlink:href (CVE-2026-49825)

Tenable has extracted the preceding description block directly from the MiracleLinux 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 remote Oracle Linux 9 host has a package installed that is affected by a vulnerability as referenced in the ELSA-2026-662040 advisory.

    - Security fix for CVE-2026-49825

Tenable has extracted the preceding description block directly from the Oracle 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 remote AlmaLinux 9 host has a package installed that is affected by a vulnerability as referenced in the ALSA-2026:66203 advisory.

    * lxml: lxml-html-clean: lxml: URL bypass vulnerability in Cleaner via missing xlink:href (CVE-2026-49825)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 remote AlmaLinux 9 host has a package installed that is affected by a vulnerability as referenced in the ALSA-2026:66204 advisory.

    * lxml: lxml-html-clean: lxml: URL bypass vulnerability in Cleaner via missing xlink:href (CVE-2026-49825)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 remote Redhat Enterprise Linux 9 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2026:66203 advisory.

    Python is an interpreted, interactive, object-oriented programming language, which includes modules,     classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to     many system calls and libraries, as well as to various windowing systems.

    Security Fix(es):

    * lxml: lxml-html-clean: lxml: URL bypass vulnerability in Cleaner via missing xlink:href (CVE-2026-49825)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 remote Redhat Enterprise Linux 9 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2026:66204 advisory.

    Python is an interpreted, interactive, object-oriented programming language, which includes modules,     classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to     many system calls and libraries, as well as to various windowing systems.

    Security Fix(es):

    * lxml: lxml-html-clean: lxml: URL bypass vulnerability in Cleaner via missing xlink:href (CVE-2026-49825)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 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
348671	TencentOS Server 4: python-lxml (TSSA-2026:1016)	Nessus	Tencent Local Security Checks	Local	high
348247	Oracle Linux 8 : python-lxml (ELSA-2026-67943)	Nessus	Oracle Linux Local Security Checks	Local	high
347924	MiracleLinux 8 : python-lxml-4.2.3-5.el8_10 (AXSA:2026-1874:02)	Nessus	Miracle Linux Local Security Checks	Local	high
346867	AlmaLinux 8 : python-lxml (ALSA-2026:67943)	Nessus	Alma Linux Local Security Checks	Local	high
346848	RockyLinux 8 : python-lxml (RLSA-2026:67943)	Nessus	Rocky Linux Local Security Checks	Local	high
346436	RHEL 8 : python-lxml (RHSA-2026:67943)	Nessus	Red Hat Local Security Checks	Local	high
345709	RHEL 9 : python-lxml (RHSA-2026:67324)	Nessus	Red Hat Local Security Checks	Local	high
345708	RHEL 9 : python-lxml (RHSA-2026:67326)	Nessus	Red Hat Local Security Checks	Local	high
345703	RHEL 9 : python-lxml (RHSA-2026:67325)	Nessus	Red Hat Local Security Checks	Local	high
345659	MiracleLinux 9 : python-lxml-4.6.5-3.el9_8.1 (AXSA:2026-1823:01)	Nessus	Miracle Linux Local Security Checks	Local	high
344830	RockyLinux 9 : python-lxml (RLSA-2026:66204)	Nessus	Rocky Linux Local Security Checks	Local	high
344828	RockyLinux 9 : python3.12-lxml (RLSA-2026:66203)	Nessus	Rocky Linux Local Security Checks	Local	high
344788	Oracle Linux 9 : ELSA-2026-66203-0: / python3.12-lxml (ELSA-2026-662030)	Nessus	Oracle Linux Local Security Checks	Local	high
344779	MiracleLinux 9 : python3.12-lxml-4.9.3-2.el9_8.1 (AXSA:2026-1813:01)	Nessus	Miracle Linux Local Security Checks	Local	high
344597	Oracle Linux 9 : ELSA-2026-66204-0: / python-lxml (ELSA-2026-662040)	Nessus	Oracle Linux Local Security Checks	Local	high
344516	AlmaLinux 9 : python3.12-lxml (ALSA-2026:66203)	Nessus	Alma Linux Local Security Checks	Local	high
344503	AlmaLinux 9 : python-lxml (ALSA-2026:66204)	Nessus	Alma Linux Local Security Checks	Local	high
344418	RHEL 9 : python3.12-lxml (RHSA-2026:66203)	Nessus	Red Hat Local Security Checks	Local	high
344415	RHEL 9 : python-lxml (RHSA-2026:66204)	Nessus	Red Hat Local Security Checks	Local	high
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

high

high

high

high

high

high

high

high

high

high

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high

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high