Apricots (pitted) — Food safety facts
Feed with care · Cats · full breakdown on the linked food page
The flesh is safe in small pieces. The pit, leaves and stem contain cyanide compounds — never allow a whole apricot.
Short answer
Small amounts of apricot flesh are safe, but watch for vomiting or diarrhea. The real danger is the pit, leaves, and stem, which contain cyanide. Offer your cat some fresh water and monitor its behavior. If you see any stomach upset, contact your veterinarian.