CVE-2026-65899: CURE53 Dompurify

Medium severity, CVSS 6.1. EPSS: 0.4% chance of exploitation in the next 30 days.

DOMPurify 3.0.0 before 3.4.9 does not reset the retained Trusted Types policy when clearConfig() is called, so a DOMPurify instance reused across trust boundaries stays bound to a previously supplied TRUSTED_TYPES_POLICY. A later caller that requests RETURN_TRUSTED_TYPE output receives a TrustedHTML object created by the old (potentially unsafe) policy rather than a clean default, which can lead to script execution at a Trusted Types sink. Passing TRUSTED_TYPES_POLICY: null on the later call also does not clear the retained policy.

Affected products

• CURE53 Dompurify: from 3.0.0, before 3.4.9 (fixed in 3.4.9)

Published 2026-07-23. Last modified 2026-10-08.