# CVE-2026-28348: lxml-html-clean: lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`

CVE-2026-28348 is fixed in 3 products on 1 platform, first by DEBIAN-CVE-2026-28348, released March 5, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-28348
- Priority: Routine
- CVSS: 6.1 (medium)
- EPSS: 0.0028
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 5, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | lxml Debian 12.15 (bookworm) | 4.9.2-1+deb12u1 | [DEBIAN-CVE-2026-28348](https://patchblox.com/security/data/fix/linux/debian-cve-2026-28348.md) | Mar 5, 2026 |
| Linux | lxml Debian 13.5 (trixie) | 5.2.0-1 | [DEBIAN-CVE-2026-28348](https://patchblox.com/security/data/fix/linux/debian-cve-2026-28348.md) | Mar 5, 2026 |
| Linux | lxml Debian 14 | 5.2.0-1 | [DEBIAN-CVE-2026-28348](https://patchblox.com/security/data/fix/linux/debian-cve-2026-28348.md) | Mar 5, 2026 |
| Linux | lxml-html-clean Debian 13.5 (trixie) | 0.4.4-1~deb13u1 | [DEBIAN-CVE-2026-28348](https://patchblox.com/security/data/fix/linux/debian-cve-2026-28348.md) | Mar 5, 2026 |
| Linux | lxml-html-clean Debian 14 | 0.4.4-1 | [DEBIAN-CVE-2026-28348](https://patchblox.com/security/data/fix/linux/debian-cve-2026-28348.md) | Mar 5, 2026 |
| Linux | python-lxml_html_clean opensuse-leap 16.0 | 0.4.2-bp160.2.1 | [OPENSUSE-SU-2026:20345-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20345-1.md) | Mar 11, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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