If you take “prey” as it’s primary meaning of “an animal hunted or seized for food, esp by a carnivorous animal”, then the answer is: none, under normal circumstances. ( I am limiting this to mammals only mind you)
Other carnivores would certainly kill or attack a small cat if the small cat got to close to the larger carnivores “kill”, or in some cases- if the small cat invaded the large carnivore’s territory.
And, any carnivore will attack and eat just about anything if it’s starving.
Thus, just becuase a wolf wouldn’t normally hunt a samll cat for FOOD, it could well kill one for other reasons, and if the wolf’s natural common prey was scarce- watch out!
Sometimes dogs will kill cats. They rarely eat them. Owls on a rare occasion will kill and (AFAIK) eat small cats. Coyotes- especially urban coyotes- will sometimes make a snack of a cat. We had a 'cat killer" coyote in San Jose- it killed about a dozen. However, it mangled the bodies and ate little if any.
Oppossums wouldn’t likely attack a cat, but a cat might attack one of them, and get very badly bitten.
Mostly, the limits on small predators are territorial and it’s prey. Of course, disease enters into it, as well as a host of other factors.
There was a thread here in GQ a while ago. I still stand by my theory: in general- mammalian carnivores don’t prey on other mammalian carnivores. Note “in general” “mammalian” and “prey” (meaning 1).