Bug 2553475

Summary: CVE-2026-49825 mingw-python-lxml: lxml: URL bypass vulnerability in Cleaner via missing xlink:href [fedora-all]
Product: [Fedora] Fedora Reporter: Siddharth Sharma <sisharma>
Component: mingw-python-lxmlAssignee: Sandro Mani <manisandro>
Status: ON_QA --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: rawhideCC: manisandro
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["06228d28-a757-4837-a927-dcf19ac86bdf"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Blocks: 2520368    

Description Siddharth Sharma 2026-10-15 14:36:43 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.
Comment 1 Fedora Update System 2026-10-17 09:24:07 UTC 
FEDORA-2026-99cd0bee1c (mingw-python-lxml-6.1.1-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-99cd0bee1c
Comment 2 Fedora Update System 2026-10-18 02:46:21 UTC 
FEDORA-2026-99cd0bee1c has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-99cd0bee1c`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-99cd0bee1c

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.