CVE-2026-92956 vm2 3.10.1 through 3.11.6 Sandbox Escape via WebAssembly.compileStreaming
Attackers can escape the vm2 sandbox to execute arbitrary code on the host system by exploiting WebAssembly streaming APIs.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-92956?
CVE-2026-92956 is a critical code injection vulnerability in patriksimek vm2, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-693
Which versions are affected by CVE-2026-92956?
2 open source packages ship an affected version, including vm2.
| Package | Affected | Fixed in |
|---|---|---|
vm2 npm | From 3.10.1 | 3.11.7 |
vm2 npm | From 3.10.1 | 3.11.7 |
How do I fix CVE-2026-92956?
Upgrade vm2 to 3.11.7 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-92956 being exploited?
There is no known exploitation of CVE-2026-92956 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as CLEANSTART-2026-XJ45265, ECHO-0394-d2d0-d026, GHSA-wjwh-qqvp-g4p4, MINI-7vcq-8rpf-mqjv, ROOT-APP-NPM-CVE-2026-92956.