How an Attacker Drained $128M from Balancer Through Rounding Error Exploitation 

By: Dikla Barda, Roaman Zaikin & Oded Vanunu  On November 3, 2025, Check Point Research’s blockchain monitoring systems detected a sophisticated exploit targeting Balancer V2’s ComposableStablePool contracts. The attacker exploited arithmetic precision loss in pool invariant calculations to drain $128.64 million across six blockchain networks in under 30 minutes. The attack leveraged a rounding error
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