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
EPSS: 0.003 (24.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 24.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.001
Affected products
Weakness classification (CWE)
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)
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.