CVE-2026-43999 Security Details

CVE ID

CVE-2026-43999

CWE

CWE-829

CWE-863

CVE Description

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.

Published

May 7, 2026

CVSS Score & Severity

7.9High

CVSS Vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H

EPSS Score

0.205%

Malware

malware

KEV Status

Not in KEV Catalog: No known exploits

Vulnerable Methods

addDefaultBuiltin()

JSVulnerable params: 0

Affected Ecosystems

affected

Source

National Vulnerability Database

References

GitHub · patriksimek/vm2PROJECT