The priest is bound by the "seal of confession",

The priest is bound by the "seal of confession", which is inviolable. "Accordingly, it is absolutely wrong for a confessor in any way to betray the penitent, for any reason whatsoever, whether by word or in any other fashion."[17] A confessor who directly violates the sacramental seal incurs an automatic excommunication whose lifting is reserved to the Holy See.[18]

In some dioceses, certain sins are "reserved" which means only certain confessors can absolve them. Some sins, such as violation of the sacramental seal, consecration of bishops without authorization by the Holy See, direct physical attacks on the Pope, and intentional desecration of the Eucharist are reserved to the Holy See. A special case-by-case faculty from the Sacred Penitentiary is normally required to absolve these sins.

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