CVE-2026-65899DOMPurify before 3.4.9 Trusted Types Policy State Contamination
Updated under an hour ago ()
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It affects cure53 DOMPurify. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.1 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Weakness (CWE)
- CWE-693
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Analyzed
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
cure53 DOMPurify cure53:dompurify (from the name) | before 3.4.9; 3.4.9 not affected | CNA record |
cure53 dompurify cure53:dompurify | from 3.0.0 before 3.4.9 | NVD |
References
- https://github.com/cure53/DOMPurify/security/advisories/GHSA-vxr8-fq34-vvx9vendor-advisory
- https://github.com/cure53/DOMPurify/commit/825e617753ac1169306a542d3174a77f717a0cf6patch
- https://www.vulncheck.com/advisories/dompurify-before-trusted-types-policy-state-contaminationthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.