XSS in Fedora-Python Lxml HTML Clean
CVE-2026-49825
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.
Vulnerability class: XSS (Cross-Site Scripting)
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N.
Affected products
- Fedora-python Lxml_html_clean — versions < 0.4.5
- Lxml — versions < 6.1.1
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-49825?
- CVE-2026-49825 is a high-severity vulnerability in Fedora-Python Lxml HTML Clean, classified under Cross-site Scripting. CVSS score: 8.2/10. Published 2026-08-20.
- How severe is CVE-2026-49825?
- High severity. CVSS v3 base score is 8.2 out of 10.