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: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

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, 27 Aug 2026 18:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-166
References
Metrics threat_severity

None

threat_severity

Important


Fri, 21 Aug 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 20 Aug 2026 17:00:00 +0000

Type Values Removed Values Added
First Time appeared Fedora-python
Fedora-python lxml Html Clean
Lxml
Lxml lxml
Vendors & Products Fedora-python
Fedora-python lxml Html Clean
Lxml
Lxml lxml

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

Fedora-python Lxml Html Clean
Lxml Lxml
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-08-21T16:41:54.849Z

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

Link: CVE-2026-49825

cve-icon Vulnrichment

Updated: 2026-08-21T16:41:48.876Z

cve-icon NVD

Status : Received

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

Modified: 2026-08-21T17:16:31.380

Link: CVE-2026-49825

cve-icon Redhat

Severity : Important

Publid Date: 2026-08-20T14:42:30Z

Links: CVE-2026-49825 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-08-28T20:30:08Z

Weaknesses