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

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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

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

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-20T20:45:04Z

Weaknesses
  • CWE-184

    Incomplete List of Disallowed Inputs

  • CWE-79

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')