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Vulnerability record · CVE-2026-49825 · published 20 August 2026

CVE-2026-49825: Cross-site scripting vulnerability

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.

8.2 CVSS 3.1 High EPSS 0.43% · top 65.3% CWE-79 · Cross-site scriptingCWE-184 · CWE-184 Awaiting Analysis
8.2CVSS 3.1 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
18 Sep 2026Last modified by NVD

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.

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

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-49825), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.