Nothing but receiving communion in a state of rebellion when you've knowingly committed a mortal sin and haven't repented of it by confession is specifically warned against by Paul in 1 Corinthians.

Whoever, therefore, eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty concerning the body and blood of the Lord. Let a person examine himself, then, and so eat of the bread and drink of the cup. For anyone who eats and drinks without discerning the body eats and drinks judgment on himself. That is why many of you are weak and ill, and some have died.h But if we judged ourselves truly, we would not be judged.

The Catechism explains further:

To respond to this invitation we must prepare ourselves for so great and so holy a moment. St. Paul urges us to examine our conscience: "Whoever, therefore, eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of profaning the body and blood of the Lord. Let a man examine himself, and so eat of the bread and drink of the cup. For any one who eats and drinks without discerning the body eats and drinks judgment upon himself." Anyone conscious of a grave sin must receive the sacrament of Reconciliation before coming to communion.

and

By the same charity that it enkindles in us, the Eucharist preserves us from future mortal sins. the more we share the life of Christ and progress in his friendship, the more difficult it is to break away from him by mortal sin. the Eucharist is not ordered to the forgiveness of mortal sins - that is proper to the sacrament of Reconciliation. the Eucharist is properly the sacrament of those who are in full communion with the Church.