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CVE-2026-28348

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-28348

Severity

6.1

Medium

CVSS V3

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Summary

lxml_html_clean: CSS @import Filter Bypass via Unicode Escapes

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.

References

Affected packages

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