What the Catholic Church has essentially said is that Jesus and his apostles neglected to include many doctrines in the original scriptures and so the CC is correcting their negligence by introducing additional doctrines. In other words, they have granted themselves a license to make up anything they want. Paul warned against this, yet they ignored it.
Galatians 1:8-12 NKJV But even if we, or an angel from heaven, preach any other gospel to you than what we have preached to you, let him be accursed. As we have said before, so now I say again, if anyone preaches any other gospel to you than what you have received, let him be accursed.