CVE-2026-49825

EUVD-2026-63390
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.
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
GitHub_MCNA
8.2 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 20.33%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
lxmllxml
𝑥
< 6.1.1
CNA
lxmllxml
𝑥
< 0.4.5
CNA
Debian logo
Debian Releases
Debian Product
Codename
lxml
bookworm
vulnerable
bookworm (security)
4.9.2-1+deb12u1
fixed
forky
6.1.3-1
fixed
sid
6.1.3-1
fixed
trixie
no-dsa
lxml-html-clean
forky
0.4.5-1
fixed
sid
0.4.5-1
fixed
trixie
no-dsa
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
lxml
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
trusty
needs-triage
xenial
needs-triage
Red Hat logo
Red Hat Enterprise Linux Releases
Red Hat Product
Release
python3-lxml
RHEL 9
0:4.6.5-3.el9_8.1
fixed
python3.12-lxml
RHEL 9
0:4.9.3-2.el9_8.1
fixed
Azure Linux logo
Azure Linux Releases
Azure Package
Release
python-lxml
Azure Linux 3.0
0:4.9.3-3.azl3
fixed
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://github.com/fedora-python/lxml_html_clean/commit/322357ac61c6cf80fcbaba53b4e92e31f3ded9f2
https://github.com/fedora-python/lxml_html_clean/releases/tag/0.4.5
https://github.com/fedora-python/lxml_html_clean/security/advisories/GHSA-4jhm-jv67-739f
https://github.com/lxml/lxml/commit/5927a6d5e851845140975d99b65461e255caaab0
https://github.com/lxml/lxml/releases/tag/lxml-6.1.1
https://github.com/fedora-python/lxml_html_clean/security/advisories/GHSA-4jhm-jv67-739f