Pope Bl. John Paul II did not bind the Catechism upon us under the assent of faith (if you read the documents preceding the first and second editions, this is evident...the very fact that there can be editions denoting CHANGE evinces fallibility). He does not even bind the religious submission of intellect and will of the whole Church throughout the world to the Catechism of the Catholic Church. All he does is order its publication, suggest it as a tool for catechists and a tool for bishops to draft local catechisms. The most anyone could jump to reasonably would be that the Catechism of the Catholic Church is bound upon our pious submission due to the credibility of the Pope's office (whosoever sits there under bare ordinary circumstance, can err).
If one were to hearken back to the First Vatican Council, it would be most evident that the Catechism of the Catholic Church does not fall under anything bound by the assent of faith (far from it).
If you have a good reason to present that the Catechism is infallible, I'd like to know it.
I am familiar with article 1124 in the Catechism. It is illogical to equate credens to fides in Latin and then especially illogical translate credens as "faith" in english.