A significant exploit has impacted Balancer in November 2025, resulting in an estimated loss of over $128 million across multiple blockchain networks. This incident highlights ongoing security challenges within the decentralized finance (DeFi) ecosystem and emphasizes the vulnerability of multi-chain smart contract deployments. The attack targeted v2 contracts on the Balancer protocol, leading to a sudden downturn in market prices as investors reacted to the news. The exploit involved unauthorized withdrawals from several digital assets such as WETH and osETH. While authorities, including the Balancer core team and blockchain security firm PeckShield, quickly acknowledged the incident, the event has sparked concern for the future of DeFi trust and security.