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Sep 23, 2026

Cosmos Hub halts for 25 hours after Neutron governance attack

Cosmos Hub validators stopped block production for nearly 25 hours following a governance attack on Neutron that initially led to losses of approximately $9.5 million, moving 1.23 million ATOM from attacker wallets after restart.

Sep 23, 2026·6 sources

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Top claims

▪Cosmos Hub validators resumed block production at block 33,086,741 on September 23, 2026, at 12:00 UTC, ending the 25-hour network freeze triggered by the Neutron governance attack
▪An attacker passed Neutron governance proposal 9, titled "AIATO: AI Agent Takeover. Phase 1: Agent Admin Registration," on September 21, 2026, which reassigned administrative rights over 11 smart contracts
▪Cosmos Hub's forced seizure of the attacker's funds was justified

Topics

Consensus mechanisms Layer 1s DeFi Crypto hacks Cosmos Hub halt after Neutron attack Blockchain governance

Related entities

Blockchain Security