Improper Initialization Affecting dompurify package, versions <3.4.11
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Test your applications- Snyk IDSNYK-JS-DOMPURIFY-17375136
- published18 Jun 2026
- disclosed18 Jun 2026
- credittrace37labs
Introduced: 18 Jun 2026
New CVE NOT AVAILABLE CWE-471 (opens in a new tab)Common Weakness Enumeration (CWE) is a category system for software weaknesses
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade dompurify to version 3.4.11 or higher.
Overview
dompurify is a DOM-only XSS sanitizer for HTML, MathML and SVG.
Affected versions of this package are vulnerable to Improper Initialization in the DOMPurify.setConfig() API when an uponSanitizeAttribute hook is registered that mutates allowedAttributes. An attacker can cause persistent modification of the attribute allowlist by submitting specially crafted content, resulting in unauthorized attributes being permitted in all subsequent sanitization calls.