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CVE-2026-49825

lxml: javascript: URL bypass in Cleaner via xlink:href

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 · 8.2 High EPSS < 1% KEV · Not listed
Vendors
Fedora-python Lxml
Products
Lxml Html Clean Lxml
CVE-2026-28348

lxml_html_clean: CSS @import Filter Bypass via Unicode Escapes

lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.4, the _has_sneaky_javascript() method strips backslashes before checking for dangerous CSS keywords. This causes CSS Unicode escape sequences to bypass the @import and expression() filters, allowing external CSS loading or XSS in older browsers. This issue has been patched in version 0.4.4.

CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed
Vendors
Fedora-python Fedoralovespython
Products
Lxml Html Clean Lxml Html Clean
CVE-2026-28350

lxml_html_clean: <base> tag injection through default Cleaner configuration

lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.4, the <base> tag passes through the default Cleaner configuration. While page_structure=True removes html, head, and title tags, there is no specific handling for <base>, allowing an attacker to inject it and hijack relative links on the page. This issue has been patched in version 0.4.4.

CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed
Vendors
Fedora-python Fedoralovespython
Products
Lxml Html Clean Lxml Html Clean