vm2 NodeVM patch bypass for CVE-2023-37903 leading to sandbox escape
CVE-2026-47137 is a patch-bypass vulnerability in the vm2 Node.js sandbox library affecting versions prior to 3.11.4. A prior fix for CVE-2023-37903 added a guard in nodevm.js intended to block the unsafe NodeVM configuration combination of nesting: true with require: false. However, the check used strict equality against false (options.require === false). An attacker can trivially bypass this guard by omitting the require option entirely, causing options.require to be undefined during the check so the protection is skipped. Immediately afterward, destructuring assigns the default require value to false, recreating the exact unsafe state the patch was meant to prevent. In this condition, sandboxed code can load vm2 inside the sandbox, create a nested VM, and escape the sandbox boundary to reach host execution primitives.
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Impact, mitigation & remediation
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Mitigation
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Exploits
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No public exploit code observed for this vulnerability.
Recent activity
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Every observed campaign linking this CVE to a named adversary.
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YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.