Vulnerability in langflow-ai langflow

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)
• Critical severity: CVSS 9.9

[ Description ]Official description

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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• github.com/langflow-ai/langflow/commit/efbc4a16e639409d938a4883463d27ef0bc637a0
• github.com/langflow-ai/langflow/pull/12290
• github.com/langflow-ai/langflow/security/advisories/GHSA-7w94-79vh-5mr2
• github.com/langflow-ai/langflow/security/advisories/GHSA-w794-rj3p-xv45