Opening
From the answer to this question - Why can the Church declare a person a saint but not state that they are damned? - we learned that the Church, and no one in the Church can declare definitively that someone is in hell.
Answering
Focusing in on the question, 'Is Judas in heaven?'
The Church has not and cannot say that he [or anyone else] is in hell, but from the words of the Lord himself, his Apostle Peter, and scripture, it is highly unlikely that he is in heaven.
Mt 26:24 (RSVCE)
24 The Son of man goes as it is written of him, but woe to that man by whom the Son of man is betrayed! It would have been better for that man if he had not been born.”Jn 17:12 (RSVCE)
12 While I was with them, I kept them in thy name, which thou hast given me; I have guarded them, and none of them is lost but the son of perdition, that the scripture might be fulfilled.Ac 1:20 (RSVCE) 20 For it is written in the book of Psalms,
‘Let his habitation become desolate, and let there be no one to live in it’; and
‘His office let another take.’
... that word 'desolate' ...
In addition to the passage in Deepu's answer, from Heb 4:1-11, it should be clear that just belonging to Israel or to the Church for that matter is not in itself enough to enter into God's definitive rest which is heaven.
Closing
An exorcist has run into 'Judas' or a supernatural entity claiming to be Judas. [cf. The Entire Case History of Anna Ecklund: America’s Most Famous Case of Possession].