Vulnerability · Published Jul 23, 2026 · Assigned by VulnCheck
CVE-2026-65899DOMPurify before 3.4.9 Trusted Types Policy State Contamination
Medium 6.1
In plain English
A medium-severity security flaw in DOMPurify from cure53. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | node-dompurify | no fix listed | DEBIAN-CVE-2026-65899 |
| Debian:13 | node-dompurify | no fix listed | DEBIAN-CVE-2026-65899 |
| Debian:14 | node-dompurify | 3.4.12+dfsg-1 | DEBIAN-CVE-2026-65899 |
| Ubuntu:22.04:LTS | node-dompurify | no fix listed | UBUNTU-CVE-2026-65899 |
| Ubuntu:24.04:LTS | node-dompurify | no fix listed | UBUNTU-CVE-2026-65899 |
| Ubuntu:26.04:LTS | node-dompurify | no fix listed | UBUNTU-CVE-2026-65899 |
| npm | dompurify | 3.4.9 | GHSA-vxr8-fq34-vvx9 |
Affected products (as reported)
Weakness: CWE-693 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
References
- GitHub Security Advisory (GHSA-vxr8-fq34-vvx9) vendor-advisory
- Patch Commit patch
- VulnCheck Advisory: DOMPurify before 3.4.9 Trusted Types Policy State Contamination third-party-advisory