CVE-2026-49825

high

Description

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

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

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

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

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

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

Details

Source: Mitre, NVD

Published: 2026-08-20

Updated: 2026-08-21

Risk Information

CVSS v2

Base Score: 8.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:P/A:N

Severity: High

CVSS v3

Base Score: 8.2

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

Severity: High

EPSS

EPSS: 0.0024