Vulnerability in Patriksimek Vm2
CVE-2026-100722
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/patriksimek/vm2/security/advisories/GHSA-2v2p-6j97-cjg9 (vendor-advisory)
- www.vulncheck.com/advisories/vm2-before-3.12.2-host-process-termination-via-con… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100722?
- CVE-2026-100722 is a medium-severity vulnerability in Patriksimek Vm2, classified under CWE-248. CVSS score: 6.8/10. Published 2026-09-27.
- How severe is CVE-2026-100722?
- Medium severity. CVSS v3 base score is 6.8 out of 10.