Trust Boundary Violation Affecting dompurify package, versions <3.4.6
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-DOMPURIFY-17344526
- published16 Jun 2026
- disclosed15 Jun 2026
- creditoffset
Introduced: 15 Jun 2026
NewCVE-2026-49458 (opens in a new tab)How to fix?
Upgrade dompurify to version 3.4.6 or higher.
Overview
dompurify is a DOM-only XSS sanitizer for HTML, MathML and SVG.
Affected versions of this package are vulnerable to Trust Boundary Violation in the sanitize function when handling DOM nodes from a different same-origin realm due to improper realm-bound instanceof checks. An attacker can inject and execute malicious markup by providing specially crafted DOM nodes from a foreign realm, which bypass internal security checks and allow executable content to persist in form attributes, template content, and attached shadow roots.