CVE-2026-49825
lxml: javascript: URL bypass in Cleaner via xlink:href
- State
- Published
- Severity
- 8.2 High
- Published
- Aug 20, 2026
- Updated
- Aug 21, 2026
- Reserved
- Jun 1, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 8.2 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N | GitHub_M |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
lxmllxml |
|
lxml_html_cleanfedora-python |
|
References
- https://github.com/fedora-python/lxml_html_clean/security/advisories/GHSA-4jhm-jv67-739f
- https://github.com/fedora-python/lxml_html_clean/commit/322357ac61c6cf80fcbaba53b4e92e31f3ded9f2
- https://github.com/lxml/lxml/commit/5927a6d5e851845140975d99b65461e255caaab0
- https://github.com/fedora-python/lxml_html_clean/releases/tag/0.4.5
- https://github.com/lxml/lxml/releases/tag/lxml-6.1.1
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