CVE-2026-49825
Publication date 20 August 2026
Last updated 8 October 2026
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| lxml | 26.04 LTS resolute |
Fixed 6.0.2-1ubuntu0.1
|
| 24.04 LTS noble |
Fixed 5.2.1-1ubuntu0.2
|
|
| 22.04 LTS jammy |
Fixed 4.8.0-1ubuntu0.1
|
|
| 20.04 LTS focal |
Fixed 4.5.0-1ubuntu0.5+esm1
|
|
| 18.04 LTS bionic |
Fixed 4.2.1-1ubuntu0.6+esm1
|
|
| 16.04 LTS xenial |
Fixed 3.5.0-1ubuntu0.4+esm3
|
|
| 14.04 LTS trusty |
Fixed 3.3.3-1ubuntu0.2+esm6
|
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CVSS version: CVSS v3.0
Base score
8.2 · High
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
References
Related Ubuntu Security Notices (USN)
- USN-8897-1
- lxml vulnerabilities
- 7 October 2026