langflow-ai Langflow up to 1.8.x MCP Stdio Transport command/env os command injection

Summaryinfo

A vulnerability was found in langflow-ai Langflow up to 1.8.x and classified as critical. The impacted element is an unknown function of the component MCP Stdio Transport. Such manipulation of the argument command/env leads to os command injection. This vulnerability is documented as CVE-2026-105740. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in langflow-ai Langflow up to 1.8.x and classified as critical. Affected by this issue is an unknown code of the component MCP Stdio Transport. The manipulation of the argument command/env with an unknown input leads to a os command injection vulnerability. Using CWE to declare the problem leads to CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.0, any authenticated Langflow user can achieve Remote Code Execution (RCE) on the server by adding an MCP server with the "Stdio" transport. The user-supplied command field is passed directly to bash -c "exec {command}" with zero validation, no allowlisting, and no sandboxing. The command executes immediately when the server list is fetched. Additionally, the env field allows arbitrary environment variable injection (e.g., LD_PRELOAD, PATH override). This vulnerability is fixed in 1.9.0.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-105740 since 10/05/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1202.

Upgrading to version 1.9.0 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• langflow-ai

Name

• Langflow

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8

Website

• Product: https://github.com/langflow-ai/langflow/

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