High [CVE-2026-49825] URL bypass vulnerability in Cleaner via missing xlink:href
This high-severity Red Hat Linux advisory covers CVE-2026-49825 affecting Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions, Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions.
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Summary
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. This vulnerability enables URL bypass attacks in embedded content such as Scalable Vector Graphics (SVG) or Mathematical Markup Language (MathML), potentially leading to information disclosure or arbitrary code execution in the context of the user's browser.
Red Hat severity: Important — CVSS 8.2 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N). Weakness: CWE-166.
Affected products named by the advisory: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.6 Extended Update Support; and 24 more.
- < 6.1.1
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
- 6.1.1
- 0.4.5
- python-lxml-0:4.2.3-5.el8_10
- python3.12-lxml-0:4.9.3-2.el9_8.1
- python-lxml-0:4.6.5-3.el9_8.1
- python-lxml-0:4.6.5-3.el9_2.1
- python-lxml-0:4.6.5-3.el9_4.1
- python3.12-lxml-0:4.9.3-2.el9_4.1
- python-lxml-0:4.6.5-3.el9_6.1
- python3.12-lxml-0:4.9.3-2.el9_6.1
- python-lxml-0:4.9.2-5.el8pc
- python-lxml-0:4.9.2-5.el9pc
- ansible-automation-platform-25/ee-minimal-rhel8:1789652412
- ansible-automation-platform-25/ee-supported-rhel8:1789633050
- ansible-automation-platform-25/ee-minimal-rhel9:1789720477
- ansible-automation-platform-25/ee-supported-rhel9:1789617630
- ansible-automation-platform-26/ee-minimal-rhel9:1789654312
- ansible-automation-platform-26/ee-supported-rhel9:1789664134
- ansible-automation-platform-26/hub-rhel9:1789611274
- ansible-automation-platform-27/ee-minimal-rhel9:1788901236
- ansible-automation-platform-27/ee-supported-rhel9:1788924033
- ansible-automation-platform-27/hub-rhel9:1789572632
- rhui5/rhua-rhel9:1789478095
- RHSA-2026:67943
- RHSA-2026:66203
- RHSA-2026:66204
- RHSA-2026:67326
- RHSA-2026:67325
- RHSA-2026:74082
- RHSA-2026:67324
- RHSA-2026:74081
- RHSA-2026:74506
- RHSA-2026:71210
- RHSA-2026:71192
- RHSA-2026:71179
- RHSA-2026:67279
- RHSA-2026:71177
- RHSA-2026:67956
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
Mitigation
Upgrade to a fixed release: 6.1.1, 0.4.5, python-lxml-0:4.2.3-5.el8_10, python3.12-lxml-0:4.9.3-2.el9_8.1, python-lxml-0:4.6.5-3.el9_8.1, python-lxml-0:4.6.5-3.el9_2.1. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
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