CVE-2026-100722 vm2 before 3.12.2 Host Process Termination via Construct Trap
An attacker can crash the host process by triggering an unhandled promise rejection via the construct trap in the vm2 sandbox.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-100722?
CVE-2026-100722 is a high-severity denial of service vulnerability in patriksimek vm2, published on 27 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
vm2 before 3.12.2 does not apply host-side Promise rejection handling in the sandbox-to-host construct trap. In BaseHandler, the apply trap calls markHostPromiseHandled() on the returned value, but the adjacent construct path returns the result of Reflect.construct without the same sanitization. If an embedder exposes a constructable host function whose constructor returns a native rejected Promise, an untrusted script executed via VM.run can invoke it with `new` and ignore the result; the rejected host Promise crosses the bridge unhandled and, under Node's strict unhandled-rejection policy, is promoted to an uncaught exception that terminates the host process.
Weakness: CWE-248
Which versions are affected by CVE-2026-100722?
2 open source packages ship an affected version, including vm2.
| Package | Affected | Fixed in |
|---|---|---|
vm2 npm | All versions | 3.12.2 |
vm2 npm | All versions | 3.12.2 |
How do I fix CVE-2026-100722?
Upgrade vm2 to 3.12.2 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-100722 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100722 exists.
Sources
Also known as CLEANSTART-2026-QS01923, ECHO-7042-16e3-9cca, GHSA-2v2p-6j97-cjg9, MINI-jxmr-7jr9-jj3g, ROOT-APP-NPM-CVE-2026-100722.