CVE-2026-49458
DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG.
Does this matter?
Lower severity and a low EPSS score (0.40%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 0.40% probability · 34th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-79, CWE-501, CWE-693
- Affected
- cure53/dompurify
- Source
- security-advisories@github.com
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.