lxml: javascript: URL bypass in Cleaner via xlink:href
CVE-2026-49825 is fixed in 5 products on 1 platform, first by python-lxml 4.2.1-1ubuntu0.6+esm1, released August 20, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| lxml · Debian 12.15 (bookworm) | 4.9.2-1+deb12u1 | DEBIAN-CVE-2026-49825 | Sep 14, 2026 |
| lxml · Debian 14 | 6.1.3-1 | DEBIAN-CVE-2026-49825 | Sep 14, 2026 |
| lxml-html-clean · Debian 14 | 0.4.5-1 | DEBIAN-CVE-2026-49825 | Sep 14, 2026 |
| python-lxml · Ubuntu 18.04.6 LTS (bionic) | 4.2.1-1ubuntu0.6+esm1 | python-lxml 4.2.1-1ubuntu0.6+esm1 | Aug 20, 2026 |
| python-lxml · Ubuntu 20.04 LTS (focal) | 4.5.0-1ubuntu0.5+esm1 | python-lxml 4.5.0-1ubuntu0.5+esm1 | Aug 20, 2026 |
| python-lxml · rocky 8 | 0:4.2.3-5.el8_10 | RLSA-2026:67943 | Sep 17, 2026 |
| python-lxml · rocky 9 | 0:4.6.5-3.el9_8.1 | RLSA-2026:66204 | Sep 11, 2026 |
| python3-lxml · RHEL 8 | 0:4.2.3-5.el8_10 | RHSA-2026:67943 | Sep 19, 2026 |
| python3-lxml · RHEL 9 | 0:4.6.5-3.el9_8.1 | RHSA-2026:66204 | Sep 13, 2026 |
| python3-lxml · Ubuntu 18.04.6 LTS (bionic) | 4.2.1-1ubuntu0.6+esm1 | python3-lxml 4.2.1-1ubuntu0.6+esm1 | Aug 20, 2026 |
| python3-lxml · Ubuntu 20.04 LTS (focal) | 4.5.0-1ubuntu0.5+esm1 | python3-lxml 4.5.0-1ubuntu0.5+esm1 | Aug 20, 2026 |
| python3-lxml · Ubuntu 22.04.1 LTS (jammy) | 4.8.0-1ubuntu0.1 | python3-lxml 4.8.0-1ubuntu0.1 | Aug 20, 2026 |
| python3-lxml · Ubuntu 24.04.5 LTS (noble) | 5.2.1-1ubuntu0.2 | python3-lxml 5.2.1-1ubuntu0.2 | Aug 20, 2026 |
| python3-lxml · Ubuntu 26.04.1 LTS (resolute) | 6.0.2-1ubuntu0.1 | python3-lxml 6.0.2-1ubuntu0.1 | Aug 20, 2026 |
| python3-lxml · almalinux 8 | 4.2.3-5.el8_10 | ALSA-2026:67943 | Sep 16, 2026 |
| python3-lxml · almalinux 9 | 4.6.5-3.el9_8.1 | ALSA-2026:66204 | Sep 9, 2026 |
| python3-lxml · ol 8 | 0:4.2.3-5.el8_10 | ELSA-2026-67943 | Sep 18, 2026 |
| python3-lxml · ol 9 | 0:4.6.5-3.el9_8.1 | ELSA-2026-66204-0 | Sep 10, 2026 |
| python3.12-lxml · RHEL 9 | 0:4.9.3-2.el9_8.1 | RHSA-2026:66203 | Sep 13, 2026 |
| python3.12-lxml · almalinux 9 | 4.9.3-2.el9_8.1 | ALSA-2026:66203 | Sep 9, 2026 |
| python3.12-lxml · ol 9 | 0:4.9.3-2.el9_8.1 | ELSA-2026-66203-0 | Sep 10, 2026 |
| python3.12-lxml · rocky 9 | 0:4.9.3-2.el9_8.1 | RLSA-2026:66203 | Sep 11, 2026 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.