CVE-2026-43999 CRITICAL

CVE-2026-43999: vm2: NodeVM builtin allowlist bypass via `module` builtin's `Module._load` allows sandbox escape

Vendor Patriksimek
Product vm2
Weakness CWE-863 · Incorrect authorization
Published May 13, 2026
Last update June 30, 2026
View on NVD All CVEs

CVSS base score

9.9/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

What the vulnerability does

01Description

vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.0, NodeVM's builtin allowlist can be bypassed when the module builtin is allowed (including via the '*' wildcard). The module builtin exposes Node's Module._load(), which loads any module by name directly in the host context, completely bypassing vm2's builtin restriction. This allows sandboxed code to load excluded builtins like child_process and achieve remote code execution. This vulnerability is fixed in 3.11.0.

Key dates

02Disclosure timeline

May 13, 2026 CVE published
June 30, 2026 Record updated