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CVE-2026-72769— n8n before 1.123.67 Prototype Pollution via VM Expression Engine

Quick assessment

Affected
n8n-io n8n
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

n8n是n8n公司开源的一款支持持续集成与交付的工作流自动化工具。 n8n 1.123.67之前版本、2.31.5之前版本和2.32.1之前版本存在输入验证错误漏洞，该漏洞源于VM表达式引擎存在原型污染，可能导致认证用户通过创建或编辑工作流表达式滥用数组元素访问获取主机内置引用并在主进程中污染原型（沙箱逃逸），从而导致拒绝服务。

CVSS 6.1 · Medium EPSS 0.51% · P42

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 6

VendorProduct Version RangeStatus
n8n-io n8n < 1.123.67 affected
1.123.67 unaffected
< 2.32.1 affected
2.32.1 unaffected
< 2.31.5 affected
2.31.5 unaffected
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I. Basic Information for CVE-2026-72769

Vulnerability Information
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Vulnerability Title
n8n before 1.123.67 Prototype Pollution via VM Expression Engine
Source: CVE Program / CVE List V5
Vulnerability Description
n8n before 1.123.67, 2.31.5, and 2.32.1 contains a prototype pollution vulnerability in the VM expression engine. An authenticated user able to create or edit a workflow expression can abuse the engine's array-element access to obtain a reference to a host built-in and pollute its prototype in the main n8n process (a sandbox escape), leading to a denial of service. Both self-hosted and cloud instances running the VM expression engine are affected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
n8n 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
n8n是n8n公司开源的一款支持持续集成与交付的工作流自动化工具。 n8n 1.123.67之前版本、2.31.5之前版本和2.32.1之前版本存在输入验证错误漏洞，该漏洞源于VM表达式引擎存在原型污染，可能导致认证用户通过创建或编辑工作流表达式滥用数组元素访问获取主机内置引用并在主进程中污染原型（沙箱逃逸），从而导致拒绝服务。
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
n8n-io n8n 0 ~ 1.123.67 -
n8n-io n8n 0 ~ 2.32.1 -
n8n-io n8n 0 ~ 2.31.5 -

II. Public POCs for CVE-2026-72769

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III. Intelligence Information for CVE-2026-72769

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Vendor Advisories for CVE-2026-72769 (2)

Same Patch Batch · n8n-io · 2026-08-11 · 16 CVEs total

CVE-2026-72772 8.9 HIGH n8n before 2.32.1 Authentication Bypass via Token Exchange
CVE-2026-72765 8.7 HIGH n8n before 2.32.1 Remote Code Execution via Expression Sandbox Escape
CVE-2026-72767 8.7 HIGH n8n before 1.123.67 Remote Code Execution via Git node
CVE-2026-72766 8.2 HIGH n8n before 1.123.67 Arbitrary File Read via Send Email Node
CVE-2026-72762 7.7 HIGH n8n before 1.123.67 Arbitrary File Write via Edit Image Node
CVE-2026-72763 7.2 HIGH n8n before 1.123.67 Credential Exfiltration via Sub-Workflow
CVE-2026-72771 7.1 HIGH n8n before 2.32.1 Credential Restriction Bypass via AI/LLM Nodes
CVE-2026-72774 7.1 HIGH n8n before 1.123.67 Authentication Bypass via HTTP Request Node
CVE-2026-72770 7.1 HIGH n8n before 1.123.67 Path Traversal via Git Node Operations
CVE-2026-72749 7.1 HIGH n8n before 1.123.67 Prototype Pollution via Edit Fields
CVE-2026-72768 6.4 MEDIUM n8n before 2.32.1 SSRF Protection Bypass via MCP Client
CVE-2026-72775 5.8 MEDIUM n8n before 1.123.67 SQL Injection via PostgresTrigger Node
CVE-2026-72764 5.8 MEDIUM n8n before 1.123.67 Module Cache Poisoning via Code Node
CVE-2026-72750 5.3 MEDIUM n8n before 1.123.67 SQL Injection via executeQuery Operation
CVE-2026-72773 4.9 MEDIUM n8n before 2.32.1 Path Traversal via computer-use search_files

IV. Related Vulnerabilities

Same product: n8n
Same vendor: n8n-io
Same weakness: CWE-1321

V. Comments for CVE-2026-72769

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