Gravity Bridge Hit by Suspected Key Leak With About $5.4 Million Stolen

Gravity Bridge, a cross-chain protocol linking Ethereum and Cosmos, confirmed a security incident after roughly $5.4 million was stolen in what investigators described as a suspected signing-key compromise. The protocol told validators and orchestrators to halt operations while the bridge remained paused during the investigation. Reported stolen assets included about $4.3 million in USDC, 274 wrapped Ether worth roughly $553,000, $434,000 in USDT, and 14.16 PAXG worth about $64,000. PeckShield said part of the funds was laundered through ChangeNOW and Binance, while the attacker still held more than 2,100 Ether worth about $4.23 million. The incident adds to a growing list of 2026 DeFi and bridge attacks, with reporting citing TRM Labs data that identified April 2026 as the most hacked month in crypto history and referencing other major exploits including Kelp DAO and Drift Protocol.