CVE-2026-49825

HIGH8.2

lxml: javascript: URL bypass in Cleaner via xlink:href

Published Aug 20, 2026

Modified 4 weeks ago

Details

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.

References

WEB

https://github.com/fedora-python/lxml_html_clean/commit/322357ac61c6cf80fcbaba53b4e92e31f3ded9f2

WEB

https://github.com/fedora-python/lxml_html_clean/releases/tag/0.4.5

WEB

https://github.com/fedora-python/lxml_html_clean/security/advisories/GHSA-4jhm-jv67-739f

WEB

https://github.com/lxml/lxml/commit/5927a6d5e851845140975d99b65461e255caaab0

WEB

https://github.com/lxml/lxml/releases/tag/lxml-6.1.1

ADVISORY