CVE-2026-41239

Description

DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Starting in version 1.0.10 and prior to version 3.4.0, `SAFE_FOR_TEMPLATES` strips `{{...}}` expressions from untrusted HTML. This works in string mode but not with `RETURN_DOM` or `RETURN_DOM_FRAGMENT`, allowing XSS via template-evaluating frameworks like Vue 2. Version 3.4.0 patches the issue.

PUBLISHED Reserved 2026-04-18 | Published 2026-04-23 | Updated 2026-04-25 | Assigner GitHub_M

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-1289: Improper Validation of Unsafe Equivalence in Input

Product status

References

github.com/...Purify/security/advisories/GHSA-crv5-9vww-q3g8

github.com/cure53/DOMPurify/releases/tag/3.4.0

cve.org (CVE-2026-41239)

nvd.nist.gov (CVE-2026-41239)

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