CVE-2026-44005: Critical vm2 Sandbox Escape Threatens Node.js Applications
The National Vulnerability Database has issued a critical alert for CVE-2026-44005, a severe vulnerability impacting vm2, an open-source sandbox for Node.js. This flaw, present in versions 3.9.6 through 3.10.5, allows attacker-controlled JavaScript within a default VM or inherited NodeVM to escape the sandbox.
According to the National Vulnerability Database, the vulnerability stems from vm2’s bridge exposing mutable proxies for host-realm intrinsic prototypes. This enables an attacker to forward sandbox writes into underlying host objects using otherReflectSet() and otherReflectDefineProperty(). The practical implication is that an attacker can modify shared host prototypes like Object.prototype, Array.prototype, and Function.prototype from within the supposedly isolated sandbox environment.
Rated with a CVSS score of 10 (CRITICAL), this vulnerability poses a direct and unmitigated risk to the integrity and confidentiality of applications utilizing affected vm2 versions. The National Vulnerability Database confirms the issue is resolved in vm2 version 3.11.0, making immediate patching essential for any organization deploying Node.js applications with vm2 sandboxing.
What This Means For You
- If your Node.js applications rely on vm2 for sandboxing untrusted code, you are exposed to a complete sandbox escape. This isn't just a theoretical bypass; it's a direct path to host system compromise. Check your vm2 version immediately. If it's between 3.9.6 and 3.10.5, you need to upgrade to 3.11.0 or later RIGHT NOW. Failure to do so leaves your applications wide open.
Related ATT&CK Techniques
🛡️ Detection Rules
5 rules · 6 SIEM formats5 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
DLL Side-Loading Detection
title: DLL Side-Loading Detection
id: scw-2026-05-13-1
status: experimental
level: high
description: |
Detects unsigned DLLs loaded by legitimate executables, a common technique for persistence and defense evasion.
author: SCW Feed Engine (auto-generated)
date: 2026-05-13
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-44005/
tags:
- attack.persistence
- attack.t1574.002
logsource:
category: image_load
product: windows
detection:
selection:
ImageLoaded|endswith:
- '.dll'
Image|endswith:
- '.exe'
signed: 'false'
condition: selection
falsepositives:
- Legitimate activity from CVE-2026-44005
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-44005 | Privilege Escalation | vm2 Node.js sandbox versions 3.9.6 to 3.10.5 |
| CVE-2026-44005 | Code Injection | vm2 bridge exposing mutable proxies for host-realm intrinsic prototypes |
| CVE-2026-44005 | Memory Corruption | Mutation of shared host Object.prototype, Array.prototype, and Function.prototype from inside vm2 sandbox |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 13, 2026 at 21:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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