🛡️ CVE-2026-41238
🟡 CVSS 6.9 — Medium ✅ No Known Exploit CWE-1321 NVD
6.9
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity Medium
CVSS Score 6.9
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N
CWE CWE-1321
Public Exploit ✅ No
Source NVD
Published 2026-04-22
Updated 2026-06-02
Modified 2026-05-05
Fix URL N/A

Affected Packages

Software From version Fixed in
dompurify — —
unknown — —

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