CVE-2026-49458

Medium

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.

SeverityMedium

CVSS6.1

Exploit probability—

ProductCure53 Dompurify

PublishedJul 14, 2026

First seenJul 14, 2026

Weakness typeCWE-79Cross-site scripting (XSS)CWE-501CWE-501 CWE-693CWE-693

How to fix

Update

cure53 dompurify3.4.6 or later
dompurify3.4.6 or later

Affected products

Product	Affected versions	Fixed in
cure53 dompurify	v < 3.4.6	3.4.6
dompurifynpm	v < 3.4.6	3.4.6

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