Cosmos EVM Vulnerability: $5.72 Million From Six Blockchains and Why Three Chains Had to Halt

If you hold tokens on a smaller blockchain, your balance depends on two things: on that blockchain, and on the software it shares with many others. August made exactly that visible. A flaw in a shared building block called Cosmos EVM was exploited on six blockchains between August 20 and 25, 2026. Around $5.72 million drained away, three chains halted operations, and Cosmos Labs says it contacted 40 networks. On August 28 the team published a post-mortem that describes the sequence openly. This article sets out what happened, why the damage figures in circulation diverge so widely, and what you can check if you hold tokens on an affected chain.

The Cosmos EVM vulnerability at a glance: $5.72 million from six chains

Cosmos EVM is a software module that extends a Cosmos blockchain with an Ethereum-compatible execution environment. A module in this sense is a finished code package that a chain team builds into its own blockchain instead of writing the function itself. The advantage is speed. The price is a shared dependency: a flaw in the module is a flaw in every chain that uses it.

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