Improper Encoding or Escaping of Output Affecting lxml package, versions <5.2.0-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published19 Jun 2026
- disclosed5 Mar 2026
Introduced: 5 Mar 2026
CVE-2026-28348 (opens in a new tab)How to fix?
Upgrade Debian:unstable lxml to version 5.2.0-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream lxml package and not the lxml package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
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.