Padding an attack payload with 100,000 newlines beat file-truncation-based scanning (ClawHub bypass)

Adversa AI·medium signal

The ClawHub bypass works by prepending roughly 100,000 newlines to a file so that the security scanner truncates the content before ever reaching the malicious payload — the detector reads whitespace, passes, and the agent reads the whole thing. It's a reminder that any scanner with a read limit has an exploitable prefix, and that your truncation boundary is a security boundary. Concrete defense: normalize and collapse whitespace *before* applying any length cap, and treat files whose byte length far exceeds their non-whitespace length as hostile by default rather than scanning the head and moving on.