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.
History

Fri, 06 Mar 2026 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 06 Mar 2026 15:30:00 +0000

Type Values Removed Values Added
First Time appeared Fedora-python
Fedora-python lxml Html Clean
Vendors & Products Fedora-python
Fedora-python lxml Html Clean

Thu, 05 Mar 2026 20:15:00 +0000

Type Values Removed Values Added
Description 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.
Title lxml_html_clean: CSS @import Filter Bypass via Unicode Escapes
Weaknesses CWE-116
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-03-05T19:49:26.385Z

Updated: 2026-03-06T17:55:36.273Z

Reserved: 2026-02-26T18:38:13.890Z

Link: CVE-2026-28348

cve-icon Vulnrichment

Updated: 2026-03-06T17:55:26.589Z

cve-icon NVD

Status : Received

Published: 2026-03-05T20:16:16.180

Modified: 2026-03-06T18:16:18.143

Link: CVE-2026-28348

cve-icon Redhat

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