---
id: CVE-2026-44005
title: vm2 is an open source vm/sandbox for Node.js
summary: >-
  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() an…
severity: critical
cvss: 10
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H'
cwe:
  - CWE-94
  - CWE-1321
  - CWE-653
vendor: vm2_project
product: vm2
affected:
  - 'vm2 >= 3.9.6, < 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-2026-44005'
references:
  - url: 'https://github.com/patriksimek/vm2/security/advisories/GHSA-vwrp-x96c-mhwq'
    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-2026-44005'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2477205'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://github.com/patriksimek/vm2/security/advisories/GHSA-vwrp-x96c-mhwq'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44005.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
epss: 0.00831
epssPercentile: 0.56094
ingestedAt: '2026-08-06T13:59:37.831Z'
---

## Overview

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.

## Affected

- `vm2 >= 3.9.6, < 3.11.0`

## Remediation

Upgrade past the affected range:

- `vm2 3.11.0`