What is CVE-2026-28348?

CVE-2026-28348 is a medium-severity vulnerability in Fedora-python Lxml_html_clean, classified under Improper Encoding or Escaping of Output. CVSS score: 6.1/10. Published 2026-03-05.

How severe is CVE-2026-28348?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Vulnerability in Fedora-python Lxml_html_clean

CVE-2026-28348

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 Unicod…

EPSS: 0.001 (16.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Fedora-python Lxml_html_clean — versions < 0.4.4

Weakness classification (CWE)

CWE-116 — Improper Encoding or Escaping of Output

References

https://github.com/fedora-python/lxml_html_clean/security/advisories/GHSA-hw26-mmpg-fqfg (x_refsource_CONFIRM)
https://github.com/fedora-python/lxml_html_clean/commit/2ef732667ddbc74ea59847bcf24b75809aaeed3b (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-28348?: CVE-2026-28348 is a medium-severity vulnerability in Fedora-python Lxml_html_clean, classified under Improper Encoding or Escaping of Output. CVSS score: 6.1/10. Published 2026-03-05.
How severe is CVE-2026-28348?: Medium severity. CVSS v3 base score is 6.1 out of 10.