CVE-2026-26956 vm2: WASM Sandbox Escape (Node 25 only)
Attackers can escape the vm2 sandbox to execute arbitrary code on the host system via WASM in Node 25.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-26956?
CVE-2026-26956 is a critical code injection vulnerability in patriksimek vm2, published on 4 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. In version 3.10.4, vm2 is vulnerable to full sandbox escape with arbitrary code execution. Attacker code inside VM.run() obtains host process object and runs host commands with zero host cooperation. This issue has been patched in version 3.10.5.
Which versions are affected by CVE-2026-26956?
2 open source packages ship an affected version, including vm2. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
vm2 npm | All versions | 3.10.5 |
vm2 npm | All versions | 3.10.5 |
Products include Vm2 Project Vm2.
How do I fix CVE-2026-26956?
Upgrade vm2 to 3.10.5 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-26956 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-26956 exists.
Other vulnerabilities in patriksimek vm2
Sources
Also known as GHSA-ffh4-j6h5-pg66, ROOT-APP-NPM-CVE-2026-26956.