CVE-2026-65899 (Medium) detected in dompurify-3.4.1.tgz

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
68/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Quiet
Tech stack
javascript
Domain
frontend, security

Research direction

Start with /ui/package.json and trace the reported dependency hierarchy through react and monaco-editor to dompurify 3.4.1. Confirm how the UI dependency is resolved, update it to the reported fixed version 3.4.9, and verify that the vulnerable dompurify version is no longer present.

Written by the indexing model from the issue text.

Description

Mend: dependency security vulnerability

CVE-2026-65899 - Medium Severity Vulnerability

Vulnerable Library - dompurify-3.4.1.tgz

DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. It's written in JavaScript and works in all modern browsers (Safari, Opera (15+), Internet Explorer (10+), Firefox and Chrome - as well as almost anything else usin

Library home page: https://registry.npmjs.org/dompurify/-/dompurify-3.4.1.tgz

Sample Path to Dependency File: /ui/package.json

Path to vulnerable library: /ui/node_modules/.pnpm/dompurify@3.4.1/node_modules/dompurify/package.json

Dependency Hierarchy:

  • @⁠postgres.ai/ce-4.0.3.tgz (Root Library)
    • react-4.7.0.tgz
      • monaco-editor-0.55.1.tgz
        • ❌ dompurify-3.4.1.tgz (Vulnerable Library)

Found in base branch: master

Vulnerability Details

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.

Publish Date: 2026-07-23

URL: CVE-2026-65899

CVSS 3 Score Details (6.1)

Base Score Metrics:

  • Exploitability Metrics:
    • Attack Vector: Network
    • Attack Complexity: Low
    • Privileges Required: None
    • User Interaction: Required
    • Scope: Changed
  • Impact Metrics:
    • Confidentiality Impact: Low
    • Integrity Impact: Low
    • Availability Impact: None

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Release Date: 2026-07-23

Fix Resolution: dompurify - 3.4.9,https://github.com/cure53/DOMPurify.git - 3.4.9

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