Balancer DeFi Protocol Loses $100M–$120M in Exploit Linked to 2023 Bug

Balancer DeFi protocol suffered an exploit on November 3, 2025, with estimated losses ranging from $100 million to $120 million. The attack targeted V2 Composable Stable Pools, while V3 remained unaffected. Early analysis suggests the vulnerability traces back to a similar rounding error first identified in August 2023.