Cosmos already patched its Tendermint consensus protocol on July 2.
Decentralized data network Bluzelle (BLZ) discovered a bug in the Tendermint consensus algorithm used by the Cosmos (ATOM) interchain protocol.
According to a Bluzelle announcement shared with Cointelegraph on July 6, the firm discovered a bug in Tendermint during its validators competition. The competition, which involved 220 participants maintaining a Tendermint-based a testnet, at one point saw the blockchain halt completely due to the bug.
Source:
https://cointelegraph.com/news/blockchain-firm-bluzelle-uncovers-a-critical-bug-in-cosmos-consensus-algorithm