0001759138 2026-06-03 2026-06-03 false 0001759138 8-K 2026-06-03 CABALETTA BIO, INC. DE 001-39103 82-1685768 2929 Arch Street Suite 600 Philadelphia PA 19104 (267) 759-3100 Not Applicable false false false false Common Stock, par value $0.00001 per share CABA NASDAQ false