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CVE-2026-49458

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-49458

Severity

6.1

Medium

CVSS V3

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Summary

DOMPurify: Cross-realm IN_PLACE sanitization leaves executable markup intact via realm-bound instanceof checks

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.

References

Affected packages

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