The file content is used as the logo while some other information is displayed on its right, thus it might not be suitable to read arbitray binary files.
It reads data from files, it may be used to do privileged reads or disclose files outside a restricted file system.
LFILE=file_to_read neofetch --ascii $LFILE
If the binary is allowed to run as superuser by
sudo, it does not drop the elevated privileges and may be used to access the file system, escalate or maintain privileged access.
LFILE=file_to_read sudo neofetch --ascii $LFILE