[ CVE-2026-92954 · Published 17 Sep 2026 ]
vm2: Host-returned Promise rejection can bypass vm2's unhandled-rejection hardening and terminate the host process
[ Why it matters ]Priority signals
- Public proof-of-concept exploit exists (CISA SSVC)
[ Description ]Official description
vm2 is a sandbox library for running untrusted JavaScript in Node.js. In versions >= 3.10.0 and <= 3.11.7, Promises returned from the host realm into the sandbox are not marked as handled at the bridge boundary; only Promises created inside the sandbox are wrapped with a rejection-swallowing handler (lib/setup-sandbox.js), and the bridge only installs host-side rejection sanitizers when sandbox code calls .then/.catch/.finally. As a result, code running in the sandbox can invoke a host function that returns a rejected Promise (for example events.once() exposed via the NodeVM events builtin, or any embedder-provided Promise-returning API) and simply ignore the return value, leaving the host Promise unhandled so that Node.js's default unhandled-rejection behavior terminates the host process. This is an incomplete fix of GHSA-hw58-p9xv-2mjh. The issue is fixed in version 3.11.8.
[ Fixes ]Fixes and patches
- vm2 3.11.8Fixed version · GitHub Advisories · npm package vm2: upgrade to 3.11.8 or later (affected >= 3.10.0, <= 3.11.7)
[ Packages ]Affected open-source packages
- vm2 npmAffected >= 3.10.0, <= 3.11.7 · fixed in 3.11.8 · GHSA-gjq8-xm47-88rc