CVE-2026-44008 vm2: Snabox breakout via `neutralizeArraySpeciesBatch`
Attackers can escape the VM2 sandbox to execute arbitrary commands on the host system via a prototype getter vulnerability.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-44008?
CVE-2026-44008 is a critical code injection vulnerability in patriksimek vm2, published on 13 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.2, the new method neutralizeArraySpeciesBatch works with objects from the other side but can call into this side via getter on the array prototype exposing objects of the wrong side into the sandbox. This can be used to get host objects and get the host Function object. This allows attackers to write code which can escape from the VM2 sandbox and execute arbitrary commands on the host system. This vulnerability is fixed in 3.11.2.
Which versions are affected by CVE-2026-44008?
2 open source packages ship an affected version, including vm2. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
vm2 npm | All versions | 3.11.2 |
vm2 npm | All versions | 3.11.2 |
Products include Vm2 Project Vm2.
How do I fix CVE-2026-44008?
Upgrade vm2 to 3.11.2 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-44008 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44008 exists.
Other vulnerabilities in patriksimek vm2
Sources
Also known as ECHO-7225-874a-912c, GHSA-9qj6-qjgg-37qq, ROOT-APP-NPM-CVE-2026-44008.