Cross-site Scripting (XSS) Affecting lxml package, versions <4.9.2-1+deb12u1


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.3% (21st percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-ECHOLATEST-LXML-19222765
  • published23 Aug 2026
  • disclosed20 Aug 2026

Introduced: 20 Aug 2026

CVE-2026-49825  (opens in a new tab)
CWE-79  (opens in a new tab)
CWE-184  (opens in a new tab)

How to fix?

Upgrade Echo:latest lxml to version 4.9.2-1+deb12u1 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 Echo. See How to fix? for Echo:latest relevant fixed versions and status.

lxml is a library for processing XML and HTML in the Python language. Prior to 6.1.1, link attributes in lxml.html.defs.link_attrs were missing xlink:href, which can be used for URL bypass attacks in embedded SVG/MathML/etc. content. This vulnerability was fixed in lxml 6.1.1 and lxml_html_clean 0.4.5.

CVSS Base Scores

version 3.1