CVE-2026-4926 (High) detected in path-to-regexp-8.3.0.tgz

[mend-bolt-for-github]

CVE-2026-4926 - High Severity Vulnerability

Vulnerable Library - path-to-regexp-8.3.0.tgz

Express style path to RegExp utility

Library home page: https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-8.3.0.tgz

Path to dependency file: /ui/package.json

Path to vulnerable library: /ui/node_modules/.pnpm/path-to-regexp@8.3.0/node_modules/path-to-regexp/package.json

Dependency Hierarchy:

• @postgres.ai/ce-4.0.3.tgz (Root Library)
  • react-scripts-5.0.1.tgz
    • webpack-dev-server-4.15.2.tgz
      • express-5.2.1.tgz
        • router-2.2.0.tgz
          • ❌ path-to-regexp-8.3.0.tgz (Vulnerable Library)

Found in base branch: master

Vulnerability Details

Impact:A bad regular expression is generated any time you have multiple sequential optional groups (curly brace syntax), such as "{a}{b}{c}:z". The generated regex grows exponentially with the number of groups, causing denial of service.Patches:Fixed in version 8.4.0.Workarounds:Limit the number of sequential optional groups in route patterns. Avoid passing user-controlled input as route patterns.

Publish Date: 2026-03-26

URL: CVE-2026-4926

CVSS 3 Score Details (7.5)

Base Score Metrics:

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

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: GHSA-j3q9-mxjg-w52f

Release Date: 2026-03-26

Fix Resolution: path-to-regexp - 8.4.0

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