CVE-2026-49458

MediumCVSS 6.1/10Last modified Oct 24, 2026

Description

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.

Metrics

CVSS 3.1 6.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79 CWE-501 CWE-693

Affected software

Vendor	Product	Versions
cure53	DOMPurify	< 3.4.6

References

https://github.com/cure53/DOMPurify/commit/bb7739e5bccec7e1ab3dae3f3e42d02db3acaaaePatch
https://github.com/cure53/DOMPurify/releases/tag/3.4.6Release Notes
https://github.com/cure53/DOMPurify/security/advisories/GHSA-hpcv-96wg-7vj8Exploit, Mitigation, Vendor Advisory
https://github.com/cure53/DOMPurify/security/advisories/GHSA-hpcv-96wg-7vj8Exploit, Mitigation, Vendor Advisory

Timeline

Published: Jul 14, 2026
Last modified: Oct 24, 2026
NVD status: Analyzed

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