CVE-2026-44008

CRITICAL

vm2: Snabox breakout via `neutralizeArraySpeciesBatch`

Title source: cna
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 9.8
EPSS 0.0008
EPSS Percentile 23.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact total

Details

CWE
CWE-668
Status published
Products (3)
npm/vm2 0 - 3.11.2npm
patriksimek/vm2 < 3.11.2
vm2_project/vm2 < 3.11.2
Published May 13, 2026
Tracked Since May 13, 2026