CVE-2026-44005 vm2: Sandbox escape
Attackers can escape the vm2 sandbox by mutating host prototypes, leading to arbitrary code execution on the host system.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-44005?
CVE-2026-44005 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. From 3.9.6 to 3.10.5, vm2's bridge exposes mutable proxies for real host-realm intrinsic prototypes and then forwards sandbox writes into the underlying host objects with otherReflectSet() and otherReflectDefineProperty(), which lets attacker-controlled JavaScript running in a default VM or inherited NodeVM mutate shared host Object.prototype, Array.prototype, and Function.prototype from inside the sandbox This vulnerability is fixed in 3.11.0.
Which versions are affected by CVE-2026-44005?
2 open source packages ship an affected version, including vm2. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
vm2 npm | From 3.9.6 | 3.11.0 |
vm2 npm | From 3.9.6 | 3.11.0 |
Products include Vm2 Project Vm2.
How do I fix CVE-2026-44005?
Upgrade vm2 to 3.11.0 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-44005 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44005 exists.
Other vulnerabilities in patriksimek vm2
Sources
Also known as GHSA-vwrp-x96c-mhwq, ROOT-APP-NPM-CVE-2026-44005.