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 v3 6.1 MEDIUM

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/cure53/DOMPurify/commit/bb7739e5bccec7e1ab3dae3f3e42d02db3acaaae	Patch
https://github.com/cure53/DOMPurify/releases/tag/3.4.6	Release Notes
https://github.com/cure53/DOMPurify/security/advisories/GHSA-hpcv-96wg-7vj8	Exploit Mitigation Vendor Advisory
https://github.com/cure53/DOMPurify/security/advisories/GHSA-hpcv-96wg-7vj8	Exploit Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:cure53:dompurify:*:*:*:*:*:*:*:*

History

24 Oct 2026, 21:10

Type	Values Removed	Values Added
Summary		(es) DOMPurify es un sanitizador de cross-site scripting solo para DOM para HTML, MathML y SVG. Antes de la versión 3.4.6, DOMPurify.sanitize(node, { IN_PLACE: true }) aceptaba nodos DOM de origen idéntico y ámbito externo mientras que las comprobaciones posteriores utilizaban constructores del ámbito padre, lo que provocaba que las comprobaciones instanceof para formularios, mapas de nodos con nombre, fragmentos de documento y elementos fallaran y omitieran las ramas de sanitización de clobber, template-content y shadow-DOM de modo que el marcado ejecutable podía sobrevivir. Este problema está solucionado en la versión 3.4.6.

Information

Published : 2026-07-14 21:17

Updated : 2026-10-24 21:10

NVD link : CVE-2026-49458

Mitre link : CVE-2026-49458

CVE.ORG link : CVE-2026-49458

JSON object : View

Products Affected

cure53

dompurify

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-501

Trust Boundary Violation

CWE-693

Protection Mechanism Failure

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