CVE-2026-5027

Think of it like an online form that lets people upload a file, but fails to correctly lock down where the file is allowed to go on your server. Attackers can trick the system into placing files in sensitive locations, which can then be used to take over the server or steal/alter data.

Real-world reporting says attackers are already using this to target Langflow servers.

This matters if you run Langflow and it is reachable from the internet (or otherwise accessible to untrusted networks).

The reported behavior indicates an attacker can use a single network request to obtain access needed to exploit the upload flaw, so the key risk gate is whether attackers can reach the vulnerable upload endpoint from outside your trusted environment.

This is RED because exploitation is already happening in the wild, with reports of thousands of Langflow instances exposed to the internet being targeted. Attackers are using the flaw to write arbitrary files and achieve unauthenticated remote code execution (RCE), so waiting for a convenient time to patch is not acceptable.