They knew every chain was at risk on 13 August. They shipped the fix quietly anyway
2026-08-31Security
A Cosmos EVM flaw let attackers underflow account balances to roughly 2^256. Cosmos Labs learned on 13 August that every chain running its software was affected, patched on the 19th without private notification, and a public pull request in a fork spelled out the exploitation path on the 20th. Six chains were drained.