CVE-2026-93753 (High) detected in deepmerge-2.2.1.tgz

[mend-bolt-for-github]

CVE-2026-93753 - High Severity Vulnerability

Vulnerable Library - deepmerge-2.2.1.tgz

A library for deep (recursive) merging of Javascript objects

Library home page: https://registry.npmjs.org/deepmerge/-/deepmerge-2.2.1.tgz

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

Path to vulnerable library: /ui/node_modules/.pnpm/deepmerge@2.2.1/node_modules/deepmerge/package.json

Dependency Hierarchy:

• @⁠postgres.ai/ce-4.0.3.tgz (Root Library)
  • formik-2.4.9.tgz
    • ❌ deepmerge-2.2.1.tgz (Vulnerable Library)

Found in base branch: master

Vulnerability Details

deepmerge through 4.3.1 contains a prototype poisoning vulnerability in the mergeObject() function that fails to properly validate keys being written to target objects. Attackers can supply malicious source objects in merge operations to inject attacker-controlled properties into the returned object's prototype, causing applications to inherit unintended values when accessing properties without own-property checks.

Publish Date: 2026-09-18

URL: CVE-2026-93753

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: High
  • Availability Impact: None

For more information on CVSS3 Scores, click here.

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