Bug 2500636 (CVE-2026-49458) - CVE-2026-49458 dompurify: DOMPurify: Cross-site scripting due to improper sanitization of DOM nodes
Summary: CVE-2026-49458 dompurify: DOMPurify: Cross-site scripting due to improper san...
Keywords:
Status: NEW
Alias: CVE-2026-49458
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-14 21:02 UTC by OSIDB Bzimport
Modified: 2026-08-31 10:37 UTC (History)
79 users (show)

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Description OSIDB Bzimport 2026-07-14 21:02:16 UTC 
DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.6, DOMPurify.sanitize(node, { IN_PLACE: true }) accepted same-origin foreign-realm DOM nodes while follow-on checks used parent-realm constructors, causing instanceof checks for forms, named node maps, document fragments, and elements to fail and skip clobber, template-content, and shadow-DOM sanitization branches so executable markup could survive. This issue is fixed in version 3.4.6.
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