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CVE-2026-58057— Flowise - Custom MCP Environment Variable Denylist Bypass via Case Sensitivity

Quick assessment

Affected
Flowise Flowise
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.

FlowiseAI Flowise是FlowiseAI公司开源的一个用于轻松构建 LLM 应用程序的工具。 Flowise 3.1.3之前版本存在输入验证错误漏洞，该漏洞源于对Windows环境变量的屏蔽列表进行大小写敏感比较，导致通过提供'node_options'绕过NODE_OPTIONS屏蔽列表，从而可能导致经过身份验证的用户在Flowise服务器环境中注入NODE_OPTIONS --require并执行任意代码。

CVSS 5.0 · Medium EPSS 1.56% · P74

Public Exploits 1

ExploitDB · 1 EDB-52623 [webapps]

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
Flowise Flowise < 3.1.3 affected
3.1.3 unaffected
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I. Basic Information for CVE-2026-58057

Vulnerability Information
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Vulnerability Title
Flowise - Custom MCP Environment Variable Denylist Bypass via Case Sensitivity
Source: CVE Program / CVE List V5
Vulnerability Description
Flowise before 3.1.3 validates Custom MCP stdio environment variables against a denylist using a case-sensitive comparison, so on Windows, where environment names are case-insensitive, supplying 'node_options' bypasses the NODE_OPTIONS denylist entry. An authenticated user who can configure a Custom MCP node can thereby inject NODE_OPTIONS --require and execute arbitrary code in the Flowise server context.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
大小写敏感处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
FlowiseAI Flowise 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FlowiseAI Flowise是FlowiseAI公司开源的一个用于轻松构建 LLM 应用程序的工具。 Flowise 3.1.3之前版本存在输入验证错误漏洞，该漏洞源于对Windows环境变量的屏蔽列表进行大小写敏感比较，导致通过提供'node_options'绕过NODE_OPTIONS屏蔽列表，从而可能导致经过身份验证的用户在Flowise服务器环境中注入NODE_OPTIONS --require并执行任意代码。
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
Flowise Flowise 0 ~ 3.1.3 -

II. Public POCs for CVE-2026-58057

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III. Intelligence Information for CVE-2026-58057

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Patches & Fixes for CVE-2026-58057 (1)

Vendor Advisories for CVE-2026-58057 (1)

Proof of Concept for CVE-2026-58057 (1)

IV. Related Vulnerabilities

Same product: Flowise
Same vendor: Flowise
Same weakness: CWE-178

V. Comments for CVE-2026-58057

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