Balancer V1 pool hacked for $234K via rounding error bug, echoing a $116M exploit in V2 last year

A Balancer V1 liquidity pool lost about $234,000 on August 31 due to a rounding error exploit, similar to a $116 million hack in Balancer V2 pools last November. The attacker manipulated the pool’s WBTC reserves to near zero, causing the contract to mint full Balancer Pool Tokens for a minimal input due to flawed math. This exploit highlights ongoing vulnerabilities in DeFi protocols, especially with wrapped tokens like WBTC. Balancer Labs shut down in March 2026 after the previous major hack, with the DAO now managing operations to reduce legal risks.