lxml_html_clean is a project for HTML cleaning functionalities copied from .

Code

The project this record applies to. Exploit listings stay in References.

• Repository · github.com

Timeline

Detection, updates, and resolution for this record.

1. Mar 5, 2026 · NIST NVD

   Detected

   lxml_html_clean is a project for HTML cleaning functionalities copied from . 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.

2. Jun 17, 2026 · NIST NVD

   Updated

   lxml_html_clean is a project for HTML cleaning functionalities copied from . 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.

Affected

• cpe fedoralovespython/lxml html cleanversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-28348

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-28348

  lxml_html_clean is a project for HTML cleaning functionalities copied from . 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

  nvd.nist.gov

References

• Patch · github.com
• Exploit · github.com