Protection Mechanism Failure Affecting dompurify package, versions <3.4.9
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-17344552
- published16 Jun 2026
- disclosed15 Jun 2026
- creditoffset
Introduced: 15 Jun 2026
CVE-2026-65899 (opens in a new tab)How to fix?
Upgrade dompurify to version 3.4.9 or higher.
Overview
dompurify is a DOM-only XSS sanitizer for HTML, MathML and SVG.
Affected versions of this package are vulnerable to Protection Mechanism Failure through the clearConfig function. An attacker can execute arbitrary scripts in a Trusted Types sink by influencing a previously supplied TRUSTED_TYPES_POLICY on a reused instance and later triggering output with RETURN_TRUSTED_TYPE: true.
Note:
This is only exploitable if a DOMPurify instance is reused across trust boundaries and a less-trusted integration or attacker has previously set an unsafe Trusted Types policy.