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10.0

vm2 sandbox can break out and access host files

CVE-2026-92956 · published 23 days ago
Summary

Versions of vm2 from 3.10.1 to 3.11.6 let code run inside the default sandbox escape to the real Node.js environment. An attacker could then read or modify files on the server. Upgrade vm2 to version 3.11.7 or later to close the escape.

What to do
  • Update vm2 to version 3.11.7.
  • Update patriksimek vm2 to version 3.11.7 or later.
Affected software
Ecosystem VendorProductAffected versions
– patriksimek vm2 < 3.11.7
npm – vm2 >= 3.10.1, <= 3.11.6
Fix: upgrade to 3.11.7
Original advisory text
vm2 sandbox escape via WebAssembly.compileStreaming Promise species bypass
vm2 versions 3.10.1 through 3.11.6 contain a sandbox escape reachable from a default `new VM()` sandbox when running on Node.js 26. WebAssembly.compileStreaming and WebAssembly.instantiateStreaming can produce a raw host-realm Promise that rejects with a host-realm error object; by controlling Symbol.species via Promise.prototype.finally, sandbox code receives that raw host error, walks from the host error constructor to the host Function constructor, and recovers the real host `process` object, gaining host Node.js capabilities (e.g. access to host modules such as fs) in the context of the process running the sandbox. No NodeVM, require permission, host object injection, or otherwise unsafe configuration is required. This is a bypass of the fix for GHSA-6j2x-vhqr-qr7q, which removed the JSPI entry points WebAssembly.promising and WebAssembly.Suspending. The issue is fixed in 3.11.7.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker full control
Severity
10.0 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-693Protection Mechanism Failure
CWE-913Improper Control of Dynamically-Managed Code Resources
Timeline
Published17 Sep 2026
Updated9 Oct 2026
First seen17 Sep 2026
Sources
CVE-2026-92956 · NVD
CVE-2026-92956 · MITRE
CVE-2026-92956 · OSV
GHSA-wjwh-qqvp-g4p4 · GHSA
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