Protection Mechanism Failure Affecting vm2 package, versions <3.11.4
Threat Intelligence
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Test your applications- Snyk IDSNYK-JS-VM2-17111337
- published31 May 2026
- disclosed29 May 2026
- creditspbavarva
Introduced: 29 May 2026
CVE-2026-47139 Â (opens in a new tab)How to fix?
Upgrade vm2 to version 3.11.4 or higher.
Overview
vm2 is a sandbox that can run untrusted code with whitelisted Node's built-in modules.
Affected versions of this package are vulnerable to Protection Mechanism Failure through the NodeVM builtin wildcard expansion in lib/builtin.js. An attacker can load Node’s private underscored network and stream builtins by supplying builtin: ['*', '-http', '-https', '-net', '-dgram', '-tls', '-dns', '-http2'] and then requiring modules such as _http_client, _http_server, or _tls_wrap. This lets sandboxed code make outbound HTTP requests or open listening sockets despite the embedder’s network exclusions, exposing localhost services, cloud metadata endpoints, and internal admin interfaces to requests originating from the host process.