Cosmos EVM Chains Halted After Security Incident

Cosmos Labs issued an urgent advisory on August 24, 2026, urging validators across multiple blockchains to immediately halt operations due to an active security incident affecting its Cosmos EVM module. The company did not identify the specific vulnerability, name all potentially affected chains, or quantify any losses in its initial announcement, stating that a full report would follow after the situation was contained. This precautionary network-wide pause has disrupted several ecosystems within the Cosmos network and drawn attention to potential systemic weaknesses in a key software component.

The advisory prompted immediate shutdowns on at least three separate networks. MANTRA stopped its chain on August 20 after detecting activity involving two project-managed wallets. The team stated it isolated the incident to its Cosmos EVM module, deployed an update, and coordinated a validator restart after a roughly 30-hour halt. MANTRA confirmed no user funds were affected, though a detailed postmortem remains unpublished. On August 22, both TAC and KiiChain reported attacks. TAC said an exploit of a precompile layer vulnerability led to the drain of one account, prompting a...