Description
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.
Published: 2026-08-20
Score: 8.2 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-4jhm-jv67-739f `lxml_html_clean.Cleaner` does not strip `javascript:` URLs from namespaced URL attributes
History

Thu, 20 Aug 2026 15:00:00 +0000

Type Values Removed Values Added
Description 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.
Title lxml: javascript: URL bypass in Cleaner via xlink:href
Weaknesses CWE-184
CWE-79
References
Metrics cvssV3_1

{'score': 8.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-08-20T14:42:30.748Z

Reserved: 2026-06-01T18:50:36.055Z

Link: CVE-2026-49825

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-20T15:17:30.707

Modified: 2026-08-20T15:17:30.707

Link: CVE-2026-49825

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses