Balancer DeFi Protocol Exploit Results in Over $128 Million Loss

On November 3, 2025, the Balancer decentralized finance protocol suffered a significant exploit, resulting in the theft of over $128 million in digital assets. The attack exploited vulnerabilities in Balancer's V2 Composable Stable Pools, specifically a rounding error in transaction handling, affecting multiple blockchain networks including Ethereum and Arbitrum. Balancer's engineering team is investigating the incident with high priority.