CVE-2026-49458

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.

CVSS 3.1

6.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS

0.4% chance of exploitation in the next 30 days; higher than 34% of CVEs (scores of 2026-10-25)

CWEs

CWE-79, CWE-501, CWE-693

Published

2026-07-14

Modified

2026-10-24

Record from

the NVD, synced 2026-10-25

Affected

• cure53:dompurify

Packages (OSV)

References

• https://github.com/cure53/DOMPurify/commit/bb7739e5bccec7e1ab3dae3f3e42d02db3acaaae
• https://github.com/cure53/DOMPurify/releases/tag/3.4.6
• https://github.com/cure53/DOMPurify/security/advisories/GHSA-hpcv-96wg-7vj8
• https://github.com/cure53/DOMPurify/security/advisories/GHSA-hpcv-96wg-7vj8

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