Operator Precedence Logic Error Affecting dompurify package, versions <3.4.0
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-16078387
- published16 Apr 2026
- disclosed16 Apr 2026
- creditkodareef5
Introduced: 16 Apr 2026
CVE-2026-41240 (opens in a new tab)How to fix?
Upgrade dompurify to version 3.4.0 or higher.
Overview
dompurify is a DOM-only XSS sanitizer for HTML, MathML and SVG.
Affected versions of this package are vulnerable to Operator Precedence Logic Error in the form of short-circuit evaluation that gives precedence to ADD_TAGS over FORBID_TAGS in _sanitizeElements(). In an application where ADD_TAGS is used as a function (via EXTRA_ELEMENT_HANDLING.tagCheck) and FORBID_TAGS is in use, an attacker can cause forbidden tags to be allowed.