CVE-2026-4800 (High) detected in lodash-4.17.21.tgz

[mend-for-github-com]

CVE-2026-4800 - High Severity Vulnerability

Vulnerable Library - lodash-4.17.21.tgz

Lodash modular utilities.

Library home page: https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz

Path to dependency file: /package.json

Path to vulnerable library: /package.json

Dependency Hierarchy:

• ❌ lodash-4.17.21.tgz (Vulnerable Library)

Found in base branch: csl

Vulnerability Details

Impact:
The fix for CVE-2021-23337 (GHSA-35jh-r3h4-6jhm) added validation for the variable option in _.template but did not apply the same validation to options.imports key names. Both paths flow into the same Function() constructor sink.
When an application passes untrusted input as options.imports key names, an attacker can inject default-parameter expressions that execute arbitrary code at template compilation time.
Additionally, _.template uses assignInWith to merge imports, which enumerates inherited properties via for..in. If Object.prototype has been polluted by any other vector, the polluted keys are copied into the imports object and passed to Function().
Patches:
Users should upgrade to version 4.18.0.
Workarounds:
Do not pass untrusted input as key names in options.imports. Only use developer-controlled, static key names.

Publish Date: 2026-03-31

URL: CVE-2026-4800

CVSS 3 Score Details (8.1)

Base Score Metrics:

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

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: GHSA-r5fr-rjxr-66jc

Release Date: 2026-03-31

Fix Resolution: lodash-amd - 4.18.0,lodash - 4.18.0,lodash.template - 4.18.0,lodash-es - 4.18.0