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Can. 1141 A marriage that is ratum et consummatum (ratified and consummated*) can be dissolved by no human power and by no cause, except death.
*This means "the spouses have performed between themselves in a human fashion a conjugal act which is suitable in itself for the procreation of offspring, to which marriage is ordered by its nature and by which the spouses become one flesh." (Can. 1061 ยง1).
One way a valid (ratified or ratum) marriage between two baptized persons or between a baptized and non-baptized person can be dissolved is if it is non-consummated (ratum et non consummatum) and
or
See: Can. 1142
Legitimate marriage of the unbaptized, even if consummated, can be dissolved in favor of the faith by the Pauline privilege, after 1 Cor. 7:15:
But if the unbeliever depart, let him depart. For a brother or sister is not under servitude [i.e., of the marriage bond] in such cases. But God hath called us in peace.
This can occur, for example, when one spouse converts to Catholicism but the other spouse "does not wish to cohabit with the baptized party or to cohabit peacefully without affront to the Creator" (Can. 1143 ยง2).