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Oh, and here's another one:

"That there is only One, Holy, Catholic and Apostolic Church we are compelled by faith to believe and hold, and we firmly believe in her and sincerely confess her, outside of whom there is neither salvation nor remission of sins . . . Furthermore, we declare, state, and define that it is absolutely necessary for the salvation of all human beings that they submit to the Roman Pontiff [Porro subesse Romano Pontifici omni humanae creaturae declaramus, dicimus, definimus, et pronunciamus omnino esse de necessitate salutis]."
-- POPE BONIFACE VIII, Bull Unam Sanctam (November 18, 1302 AD) as cited in The Christian Faith by Neuner/Dupuis, page 280-1

So, either Pope Boniface VIII was not only wrong, but downright heretical in his bull, or it is the official Catholic teaching that all Protestants are going to hell.

Unam Sanctam has been heavily treated elsewhere. I'll give you the short version. It was addressed to Phillip the Fair, King of France, who claimed to be a Catholic. That is the individual to whom that declaration is specifically addressed. And the "subjection" the Pope has in mind is not "you must be a Catholic" (Phillip already claimed to be that) but "if you're a Catholic, you need to obey me".

It's actually quoted from a discussion by Aquinas, which is more complete and does not exclude the idea of a non-Catholic who believes he is acting without fault being saved. This was common knowledge at the time, not a novelty. (Trent affirmed it, Pius IX affirmed it, Vatican II affirmed it ... it's old stuff.)