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CVE-2026-12940— Langflow is affected by remote code execution due to multiple unauthenticated and insufficiently authorized API endpoints

Quick assessment

Affected
IBM Langflow OSS
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.

IBM Langflow OSS是美国IBM公司的一个开源的低代码可视化AI工作流构建工具，它让开发者能通过拖拽组件的方式快速搭建、部署和迭代AI智能体与RAG应用，同时支持用Python进行深度定制以集成企业系统。 IBM Langflow OSS 1.0.0版本至1.10.1版本存在命令注入漏洞，该漏洞源于MCP stdio启动器中的环境变量注入问题，由于DANGEROUS_ENV_VARS黑名单未包含SHELLOPTS、BASHOPTS和PS4环境变量，可能导致未经身份验证的攻击者远程执行代码。

CVSS 9.8 · Critical EPSS 0.94% · P61

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
IBM Langflow OSS 1.0.0≤ 1.10.1 affected
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I. Basic Information for CVE-2026-12940

Vulnerability Information
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Vulnerability Title
Langflow is affected by remote code execution due to multiple unauthenticated and insufficiently authorized API endpoints
Source: CVE Program / CVE List V5
Vulnerability Description
IBM Langflow OSS 1.0.0 through 1.10.1  are vulnerable to unauthenticated remote code execution via environment variable injection in the MCP (Model Context Protocol) stdio launcher. The vulnerability exists in src/lfx/src/lfx/base/mcp/util.py where the DANGEROUS_ENV_VARS blocklist fails to include SHELLOPTS , BASHOPTS , and PS4 environment variables.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
IBM Langflow OSS 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
IBM Langflow OSS是美国IBM公司的一个开源的低代码可视化AI工作流构建工具，它让开发者能通过拖拽组件的方式快速搭建、部署和迭代AI智能体与RAG应用，同时支持用Python进行深度定制以集成企业系统。 IBM Langflow OSS 1.0.0版本至1.10.1版本存在命令注入漏洞，该漏洞源于MCP stdio启动器中的环境变量注入问题，由于DANGEROUS_ENV_VARS黑名单未包含SHELLOPTS、BASHOPTS和PS4环境变量，可能导致未经身份验证的攻击者远程执行代码。
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
IBM Langflow OSS 1.0.0 ~ 1.10.1 cpe:2.3:a:ibm:langflow_oss:1.0.0:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-12940

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III. Intelligence Information for CVE-2026-12940

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Vendor Advisories for CVE-2026-12940 (1)

Same Patch Batch · IBM · 2026-07-30 · 35 CVEs total

CVE-2026-12946 9.9 CRITICAL Remote Code Execution in CUGA Component CodeAgent
CVE-2026-13435 9.9 CRITICAL Python Interpreter Sandbox Bypass Leading to Sensitive Data Exposure
CVE-2026-15435 9.8 CRITICAL IBM App Connect Enterprise is vulnerable to arbitrary file write vulnerability
CVE-2026-12943 9.8 CRITICAL This Power Hardware Management Console update is being released to address
CVE-2026-12118 9.8 CRITICAL IBM webMethods Integration could allow an unauthenticated remote attacker to execute arbit
CVE-2026-11707 9.3 CRITICAL Multiple vulnerabilities have been identified in IBM WebSphere Application Server shipped
CVE-2026-14522 8.8 HIGH IBM App Connect Enterprise is vulnerable to an arbitrary file read and arbitrary changes t
CVE-2026-11536 8.5 HIGH IBM WebSphere Application Server is affected by a remote code execution vulnerability
CVE-2026-10535 8.4 HIGH IBM® Db2® is vulnerable to buffer overflow in setgid helper db2flacc which can lead to pri
CVE-2026-11885 8.4 HIGH Power System update in Buffer Copy
CVE-2026-14980 8.3 HIGH IBM WebSphere Application Server Liberty is affected by a cross-site request forgery
CVE-2026-14519 7.5 HIGH IBM App Connect Enterprise is vulnerable to an arbitrary file read and arbitrary changes t
CVE-2024-25039 7.5 HIGH IBM Engineering Requirements Management DOORS and DOORS Web Access is affected by multiple
CVE-2026-10545 7.5 HIGH IBM Planning Analytics Local is affected by Open Redirect
CVE-2026-12733 7.5 HIGH IBM DataPower Gateway affected by denial of service
CVE-2026-12942 7.5 HIGH Langflow is affected by path traversal due to multiple unauthenticated and insufficiently
CVE-2026-9322 7.5 HIGH IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by
CVE-2026-16308 7.5 HIGH IBM Enterprise Build of Quarkus is affected by a DoS vulnerability
CVE-2026-10842 7.5 HIGH IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by
CVE-2026-11897 7.5 HIGH IBM WebSphere Application Server Liberty is affected by a denial of service vulnerability

Showing top 20 of 35 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Langflow OSS
Same vendor: IBM
Same weakness: CWE-78