initial-setup accepts weak passwords

Hi,

The initial-setup just after the installation of Fedora 25 (or any version) accepts weak
passwords for root and the other users created after the installation. I tried the
password 'a' and it accepted without any strict verification. Found this in Fedora
25, but I think it is the same for all versions, including Rawhide. Is this a bug ?

Thanks,
Jos Collin