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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 4
https://github.com/langflow-ai/langflow/commit/efbc4a16e639409d938a4883463d27ef…
security-advisories@github.com
https://github.com/langflow-ai/langflow/pull/12290
security-advisories@github.com
https://github.com/langflow-ai/langflow/security/advisories/GHSA-7w94-79vh-5mr2
security-advisories@github.com
https://github.com/langflow-ai/langflow/security/advisories/GHSA-w794-rj3p-xv45
security-advisories@github.com