Let's just cut to the chase...The Catechism of the Catholic Church does not contain any heresies.
It does not teach that the Mass is a memorial primarily and a sacrifice secondarily. It does not present a false understanding of Natural Family Plannning. It does not teach a watered down version of Baptism.
I have heard all these before, along with others. Funny thing, no one can show any heresy, not even with they delibertly take things out of context and misquote it.
God doesn't set His children up. He does not give them a Church which He promises to protect from error, and then let that Church write a Catechism that is filled with error. His yoke is easy His burden light. Satan wants you to think that He would twist things and let the Church lead it's flock into error, but that's the Father of Lies speaking.