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CVE-2026-49825 is an improper URL-sanitization vulnerability in lxml and its separately maintained lxml_html_clean component. Versions of lxml before 6.1.1 and lxml_html_clean before 0.4.5 omit the namespaced xlink:href attribute from lxml.html.defs.link_attrs. Consequently, Cleaner can fail to recognize and scrub dangerous URI schemes in xlink:href attributes embedded in SVG, MathML, or similar markup, permitting attacker-controlled script URLs to survive sanitization.
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No public exploit code observed for this vulnerability.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-accessible vulnerability affecting Unity Linux systems, requiring user interaction and no privileges, which can result in high confidentiality impact and low integrity impact across a changed security scope.
A specific vulnerability tracked as CVE-2026-49825 affecting the Ubuntu Linux lxml package across multiple Ubuntu LTS releases, as referenced by a Nessus plugin for unpatched systems.
A vulnerability in lxml and lxml_html_clean where missing `xlink:href` in `lxml.html.defs.link_attrs` could enable URL bypass attacks in embedded SVG/MathML and similar content.
A critical Firefox JavaScript engine memory corruption vulnerability that could allow arbitrary code execution through malicious web content.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.