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# 🚨 Balancer breakout: losses exceed 128 million Dollar
## What happened?
On November 3, 2025, the Balancer platform, one of the largest automated market maker protocols (AMM) on the Ethereum network, suffered a major breakout that resulted in the loss of over 128 million Dollars in digital assets.
## Technical Details 🔍
The breakout specifically targeted Balancer V2 Composable Stable Pools, exploiting a subtle vulnerability in the smart contracts related to a rounding and precision error. The flaw was in the validateUserBalanceOp function, which allowed attackers to make unauthorized withdr