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CVE-2026-28348

lxml_html_clean: CSS @import Filter Bypass via Unicode Escapes

Published: Mar 5, 2026Updated: Mar 6, 2026 Sources: CVE List NVD GHSA BDUCWE-116
NVD MITRE
6.1CVSSMEDIUM
EPSS Score
0.2%
Top 86.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-116

Affected Products

lxml-html-cleanPyPIOSS Libraries
lxml_html_cleanСообщество свободного программного обеспечения
On-prem
Operating Systems / linux-distro
Kaspersky Anti Targeted Attack PlatformАО «Лаборатория Касперского»Security Products
Kaspersky Endpoint Detection and ResponseАО «Лаборатория Касперского»Security Products
lxml_html_cleanfedora-python
Library
OSS Libraries / pypi
pypipackage-ecosystemOSS Libraries
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
ао «лаборатория касперского»commercialRUSecurity Productsaka kaspersky, ao laboratoriya kasperskogo
fedora-pythonoss-projectOSS Librariesaka fedora-python

Exploitability

Official Patch Available

References

https://github.com/fedora-python/lxml_html_clean/commit/2ef732667ddbc74ea59847bcf24b75809aaeed3b
github.com
https://github.com/fedora-python/lxml_html_clean/security/advisories/GHSA-hw26-mmpg-fqfg
github.com
https://nvd.nist.gov/vuln/detail/CVE-2026-28348
nvd.nist.gov
and 4 more references View all →

Timeline

Published
Mar 5, 2026
Last Updated
Mar 6, 2026

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