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9.5

vm2 sandbox can let attacker run host commands

CVE-2026-92935 · published 23 days ago
Summary

Versions of the vm2 sandbox library between 3.11.4 and 3.11.6 can be tricked into loading its own code and creating a second sandbox with fewer restrictions. This lets a malicious script run system commands with the same rights as the server’s Node.js process. Upgrade to version 3.11.7 or later to close the gap.

What to do
  • Update vm2 to version 3.11.7.
  • Update patriksimek vm2 to version 3.11.7 or later.
Affected software
Ecosystem VendorProductAffected versions
– patriksimek vm2 < 3.11.7
npm – vm2 >= 3.11.4, <= 3.11.6
Fix: upgrade to 3.11.7
Original advisory text
vm2: NodeVM nesting guard accepts array-shaped require and permits host RCE
vm2 is a sandbox for running untrusted Node.js code. In versions >= 3.11.4 and <= 3.11.6, the NodeVM constructor computes `hasRealRequireConfig` with `typeof requireOpts === 'object' && requireOpts !== null`, so an array-shaped `require` value (for example `require: []`) satisfies the guard that is meant to reject nesting without an explicit require configuration. `makeResolverFromLegacyOptions()` then destructures the array into undefined option fields and returns a resolver containing only `NESTING_OVERRIDE.vm2`. As a result, an attacker who can supply JavaScript executed by a NodeVM configured with truthy `nesting` and an array-shaped `require` (e.g. `new NodeVM({nesting: true, require: []})`) can require the host `vm2` module, create an inner NodeVM with an attacker-chosen builtin allowlist (such as `child_process`), and execute arbitrary commands with the privileges of the host Node.js process, escaping the sandbox. Outer builtin restrictions do not constrain the attacker-created inner NodeVM. This issue is fixed in vm2 3.11.7.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
9.5 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-913Improper Control of Dynamically-Managed Code Resources
Timeline
Published17 Sep 2026
Updated9 Oct 2026
First seen17 Sep 2026
Sources
CVE-2026-92935 · NVD
CVE-2026-92935 · MITRE
CVE-2026-92935 · OSV
GHSA-8hr7-r645-pc6w · GHSA
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