---
id: CVE-2026-44004
title: vm2 is an open source vm/sandbox for Node.js
summary: >-
  vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.0, sandboxed code
  can call Buffer.alloc() with an arbitrary size to allocate memory directly on
  the host heap. Because Buffer.alloc is a synchronous C++ native call, vm2's
  timeo…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-770
  - CWE-1285
vendor: vm2_project
product: vm2
affected:
  - vm2 < 3.11.0
patched:
  - vm2 3.11.0
published: '2026-05-13'
updated: '2026-08-06'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-44004'
references:
  - url: 'https://github.com/patriksimek/vm2/security/advisories/GHSA-6785-pvv7-mvg7'
    label: security-advisories@github.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:50850'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/security/cve/CVE-2026-44004'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2477195'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://github.com/patriksimek/vm2/security/advisories/GHSA-6785-pvv7-mvg7'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44004.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
epss: 0.00665
epssPercentile: 0.49605
ingestedAt: '2026-08-06T13:59:37.799Z'
---

## Overview

vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.0, sandboxed code can call Buffer.alloc() with an arbitrary size to allocate memory directly on the host heap. Because Buffer.alloc is a synchronous C++ native call, vm2's timeout option cannot interrupt it. A single request can exhaust host memory and crash the process with a FATAL ERROR: Reached heap limit. This vulnerability is fixed in 3.11.0.

## Affected

- `vm2 < 3.11.0`

## Remediation

Upgrade past the affected range:

- `vm2 3.11.0`