CVE-2026-44008 CRITICAL

CVE-2026-44008: vm2: Snabox breakout via `neutralizeArraySpeciesBatch`

Vendor Patriksimek
Product vm2
Weakness CWE-668
Published May 13, 2026
Last update June 30, 2026

CVSS base score

9.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 13, 2026 CVE published
June 30, 2026 Record updated