PT-2026-63985 · Cure53 · Dompurify

Offset · CVE-2026-65899 · Published 2026-07-23 · Updated 2026-07-23

Mitre

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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.

Fix

Protection Mechanism Failure

Weakness Enumeration

CWE-693

Related Identifiers

CVE-2026-65899

Affected Products

Dompurify

References · 4

• https://github.com/cure53/DOMPurify/commit/825e617753ac1169306a542d3174a77f717a0cf6 · Patch
• https://github.com/cure53/DOMPurify/security/advisories/GHSA-vxr8-fq34-vvx9 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-65899 · Security Note
• https://vulncheck.com/advisories/dompurify-before-trusted-types-policy-state-contamination · Note