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CVE-2026-47683— vm2: bufferAllocLimit cap bypassed by Buffer.concat and Buffer.from arrayLike

Quick assessment

Affected
patriksimek vm2
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Patrik Simek vm2是Patrik Simek个人开发者的一个运行不受信任代码的沙箱环境。 Patrik Simek vm2 3.11.6之前版本存在资源管理错误漏洞，该漏洞源于lib/setup-sandbox.js中的bufferAllocLimit限制未涵盖攻击者控制长度的Buffer.concat(list, totalLength)或Buffer.from(arrayLike)操作，允许沙箱代码执行大型同步主机外部内存分配，绕过配置上限并耗尽主机进程。

CVSS 8.7 · High EPSS 0.31% · P23

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
patriksimek vm2 < 3.11.6 affected
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I. Basic Information for CVE-2026-47683

Vulnerability Information
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Vulnerability Title
vm2: bufferAllocLimit cap bypassed by Buffer.concat and Buffer.from arrayLike
Source: CVE Program / CVE List V5
Vulnerability Description
vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.6, the bufferAllocLimit enforcement in lib/setup-sandbox.js does not cover Buffer.concat(list, totalLength) or Buffer.from(arrayLike) with an attacker-controlled length, allowing sandbox code to perform large synchronous host external-memory allocations that bypass the configured cap and can exhaust the host process. This issue is fixed in version 3.11.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Patrik Simek vm2 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Patrik Simek vm2是Patrik Simek个人开发者的一个运行不受信任代码的沙箱环境。 Patrik Simek vm2 3.11.6之前版本存在资源管理错误漏洞，该漏洞源于lib/setup-sandbox.js中的bufferAllocLimit限制未涵盖攻击者控制长度的Buffer.concat(list, totalLength)或Buffer.from(arrayLike)操作，允许沙箱代码执行大型同步主机外部内存分配，绕过配置上限并耗尽主机进程。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
patriksimek vm2 < 3.11.6 -

II. Public POCs for CVE-2026-47683

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8372 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-47683

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Vendor Advisories for CVE-2026-47683 (1)

Vendor Pages for CVE-2026-47683 (1)

Same Patch Batch · patriksimek · 2026-08-17 · 3 CVEs total

CVE-2026-47686 9.9 CRITICAL vm2: Missing Error.cause Sanitization Enables VM2 Sandbox Escape to RCE
CVE-2026-47698 9.8 CRITICAL vm2: Sandbox Breakout Using Dangerous Host Proto Mutators

IV. Related Vulnerabilities

Same product: vm2
Same vendor: patriksimek
Same weakness: CWE-770

V. Comments for CVE-2026-47683

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