Balancer DeFi Exploit: $128M Loss Due to Rounding Error

Balancer’s recent $128 million exploit, affecting both ETH and Balancer Pool Tokens, stemmed from a mathematical error in its V2 Composable Stable pools. The incident occurred on November 3, 2025, highlighting the vulnerability of DeFi’s arithmetic precision. Balancer acted swiftly to contain the damage by pausing impacted pools for analysis. The company continues working with security experts to understand and address this issue.