There is a detailed and large chunk of lore supporting the idea that somewhere within the Star Wars universe there is a ship containing a virus that turns living things into "zombies" and what I would like to know is whether or not this is true.
You may be referring to Project Blackwing:
The virus was accidentally created while working on an experiment to revive necrotic tissue, however, killed its hosts instead, attacking their biological tissue and turning their lifeless bodies into cannibalistic, brutal zombies.
This was described in the novel Death Troopers and included in the Star Wars: Commander mobile strategy game. Wikia suggests the latter makes it part of canon.
This news release from starwars.com makes it sound like much like a Call of Duty style "Nazi Zombies"
This information is referenced in another answer on this site which can be found by searching for "[star-wars] zombies".
In Star Wars: The Clone Wars, there was an episode where Barriss Offee and Ahsoka Tano are on board a ship with Tango Company (Clones). Brain worms are on board the ship, and they take over the bodies of the Clones, with the plan to eventually kill the Jedi. They fail to cover their tracks, and they are stopped. I don't remember if this happened in this episode, but at one point Barriss Offee got controlled by a brain worm, and attempted to kill Ahsoka herself. This failed, however, because the worms couldn't survive in cold temperatures (I don't remember where this came from, maybe that show). Hope that answered your question even more.