Apple has provided a detailed explanation in its support documentation regarding a novel security feature implemented in terminal applications for macOS. This feature was initially rolled out with macOS 26.4, which was released in March 2026. Its primary objective is to thwart fraud attempts that exploit pasted commands. When a user tries to paste a command that could potentially be harmful into the terminal, the system promptly displays a warning window. This action serves to block the command from being executed and alerts the user to the possible presence of malware.

The mechanism is particularly designed to safeguard ordinary users who may not be well-versed in terminal operations. It is especially vigilant when commands are sourced from external applications, such as webpages, chat tools, or emails. The system employs intelligent recognition of user operation patterns. For instance, it will display a warning during the first instance of cross-application pasting. However, to maintain a seamless user experience, it will not repeat the prompt for subsequent identical scenarios, thereby striking a balance between security and usability.

Moreover, if the system identifies a command as known malware, it will outright block the paste without offering the user an option to proceed. In cases where users believe that a command has been incorrectly flagged, they have the option to submit an error report to request a review of the decision.