CVE-2025-3248

This flaw lets someone on the internet send a special request to your Langflow server that can cause the server to run code of the attacker’s choice. Think of it like leaving an “upload and run” door unlocked at your office—if it’s reachable, a bad actor can potentially break in and take control. The impact can include stealing data, shutting the service down, or being used as a launch point for ransomware.

This matters if your business runs Langflow (or the langflow-base component) and attackers can reach the /api/v1/validate/code endpoint. Because it is unauthenticated and can be triggered remotely without user interaction, it’s primarily a network-exposure problem rather than a “someone clicked something” problem. Treat it as a risk if the vulnerable endpoint is reachable from the internet (or otherwise reachable by untrusted users).

This is urgent because it is confirmed in CISA’s KEV list, meaning it has been recognized as a real, actively addressed threat. The vulnerability is unauthenticated and allows remote arbitrary code execution, and public exploits exist—so attackers do not need to first get a valid login. With a CISA remediation due date of 2025-05-26, you should treat this as a priority to remove exposure immediately.