CVE-2026-4800
HIGHlodash vulnerable to Code Injection via `_.template` imports key names
Title source: cnaExploitation Summary
EIP tracks 3 public exploits for CVE-2026-4800. PoCs published by adminlove520, SvenLie, threalwinky.
AI-analyzed exploit summary The repository contains only a basic Next.js project structure with no exploit code or technical details related to CVE-2026-4800. It appears to be a placeholder or template project.
Description
Impact: The fix for CVE-2021-23337 (https://github.com/advisories/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.
Exploits (3)
The repository contains only a basic Next.js project structure with no exploit code or technical details related to CVE-2026-4800. It appears to be a placeholder or template project.
This repository contains a functional proof-of-concept exploit for CVE-2026-4800, demonstrating a prototype pollution vulnerability in Lodash that leads to remote code execution (RCE). The exploit leverages prototype pollution to inject malicious code into the `imports` property, which is then executed when Lodash processes template settings.
Scores
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H