Bug 2553476

Summary:	CVE-2026-49825 python-lxml: lxml: URL bypass vulnerability in Cleaner via missing xlink:href [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Siddharth Sharma <sisharma>
Component:	python-lxml	Assignee:	Python Maintainers <python-maint>
Status:	CLOSED NOTABUG	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	high
Version:	rawhide	CC:	cstratak, igor.raits, lbalhar, me, mhroncok, mizdebsk, python-maint, python-packagers-sig
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["06228d28-a757-4837-a927-dcf19ac86bdf"]}
Fixed In Version:		Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-10-15 15:14:41 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2520368

Description Siddharth Sharma 2026-10-15 14:37:57 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 Miro Hrončok 2026-10-15 15:14:41 UTC

"""This vulnerability was fixed in lxml 6.1.1 and lxml_html_clean 0.4.5."""