Vulnerability · Published Sep 27, 2026 · Assigned by VulnCheck

CVE-2026-100722vm2 before 3.12.2 Host Process Termination via Construct Trap

Medium 6.8

In plain English

A medium-severity security flaw in vm2 from patriksimek. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.8Medium

Exploit odds (30 days)0.3%top 75.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	vm2	3.12.2	GHSA-2v2p-6j97-cjg9

Affected products (as reported)

Vendor	Product	Versions
patriksimek	vm2	0 – before 3.12.2

Weakness: CWE-248 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H

References

GitHub Security Advisory (GHSA-2v2p-6j97-cjg9) vendor-advisory
VulnCheck Advisory: vm2 before 3.12.2 Host Process Termination via Construct Trap third-party-advisory