PYSEC-2026-2201

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Import Source

https://github.com/pypa/advisory-database/blob/main/vulns/lxml-html-clean/PYSEC-2026-2201.yaml

JSON Data

https://api.osv.dev/v1/vulns/PYSEC-2026-2201

Aliases

Published

2026-03-05T20:16:16.180Z

Modified

2026-07-13T07:15:27.789764306Z

Severity

6.1 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N CVSS Calculator

Summary

[none]

Details

lxmlhtmlclean is a project for HTML cleaning functionalities copied from lxml.html.clean. Prior to version 0.4.4, the hassneaky_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.

References

Affected packages

PyPI / lxml-html-clean

Package

Name: lxml-html-clean; View open source insights on deps.dev
Purl: pkg:pypi/lxml-html-clean

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

0.4.4

Affected versions

0.*

0.1.0

0.1.1

0.2.0

0.2.1

0.2.2

0.3.0

0.3.1

0.4.0

0.4.1

0.4.2

0.4.3

Database specific

source

"https://github.com/pypa/advisory-database/blob/main/vulns/lxml-html-clean/PYSEC-2026-2201.yaml"