CVE-2026-41238

MEDIUM

6.9

Description

DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Versions 3.0.1 through 3.3.3 are vulnerable to a prototype pollution-based XSS bypass. When an application uses `DOMPurify.sanitize()` with the default configuration (no `CUSTOM_ELEMENT_HANDLING` option), a prior prototype pollution gadget can inject permissive `tagNameCheck` and `attributeNameCheck` regex values into `Object.prototype`, causing DOMPurify to allow arbitrary custom elements with arbitrary attributes — including event handlers — through sanitization. Version 3.4.0 fixes the issue.

CVE Details

CVSS v3.1 Score6.9

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionREQUIRED

Published4/23/2026

Last Modified4/23/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-79CWE-1321

References

https://github.com/cure53/DOMPurify/releases/tag/3.4.0(security-advisories@github.com)

https://github.com/cure53/DOMPurify/security/advisories/GHSA-v9jr-rg53-9pgp(security-advisories@github.com)

https://github.com/cure53/DOMPurify/security/advisories/GHSA-v9jr-rg53-9pgp(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

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