What’s Vulnerable › Vulnerabilities

CVE-2026-49825: lxml: javascript: URL bypass in Cleaner via xlink:href

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-20 · updated 2026-10-26
• Weakness: CWE-79

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.

Affected products

• fedora-python lxml_html_clean: before 0.4.5
• lxml: before 6.1.1

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

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