Apparently there could be a memory zero-day exploit with bitcoind [Likely not be anything to be worried about] #2744

http://www.reddit.com/r/Bitcoin/comments/1fqu47/there_is_a_definite_bug_in_bitcoinqt_and_it/

It seems to require access to the machine that it's running on, at which point the possible exploit is mostly useless. How the memory is corrupted is unclear.