6.1

CVE-2026-65899: DOMPurify before 3.4.9 Trusted Types Policy State Contamination

Analyzed
AliasesUBUNTU-CVE-2026-65899DEBIAN-CVE-2026-65899CGA-2jjw-q9hq-jgw8
Published 23-07-2026Last modified 08-10-2026

Vulnerability summary

CVE-2026-65899 is a medium (CVSS 6.1) Protection Mechanism Failure vulnerability in cure53 dompurify. EPSS estimates a 0.41% chance of exploitation in the next 30 days, higher than 35.5% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Routine

Not severe (CVSS 5.1, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.1/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.41%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 3 · Related 2
OPENSUSE-SU-2026:11723-1RHSA-2026:58500RHSA-2026:58502CGA-93J5-6RFX-X453

Timeline

  1. 23-07-2026
    PublishedVulnerability first disclosed.
  2. 08-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

10 scores · 7 sources · 2 versions

EPSS trend

Probability

0.41%

Chance of exploitation in the next 30 days

Percentile

36%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.41% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • githubUnverified

    Dompurify

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard69 products
  • airflow-2All versions (No fix recorded)
  • airflow-core-2All versions (No fix recorded)
  • gitlab-rails-ce-18.1All versions (No fix recorded)
  • gitlab-rails-ce-18.10All versions (No fix recorded)
  • gitlab-rails-ce-18.11All versions (No fix recorded) | < 18.11.13-r0
Wolfi17 products
  • langfuse-3-compat< 3.225.7-r6
  • langfuse-3-worker< 3.191.0-r0
  • nextcloud-server-32< 32.0.12-r4
  • nextcloud-server-33< 33.0.6-r5
  • opensearch-dashboards-3< 3.7.0-r0
Cure531 product
Debian1 product
  • node-dompurifyAll versions (No fix recorded) | < 3.4.12+dfsg-1
Npm1 product
  • dompurify< 3.4.9
Ubuntu1 product
  • node-dompurifyAll versions (No fix recorded)

6 vendors · 90 products

References

9 links