In macOS 26.4, Apple introduced new popup warnings when you try to paste a command into the Terminal. Now, a new support document explains why these and other Mac Terminal popups appear.
Apple support document explains Terminal prompts being blocked by macOS
Today Apple published a new support document titled, “If your Mac blocks a Terminal command paste or script.”
When macOS 26.4 shipped earlier this year, it came with a new security feature to protect unsuspecting Mac users from Terminal-based malware.
The feature is an alert informing you that your paste into Terminal has been blocked. It warns you that the text you were trying to paste might include malware.
