A Mempool Eviction Attack is a type of denial-of-service attack targeting the transaction memory pool of a blockchain network. Attackers flood the mempool with low-fee transactions, causing legitimate, higher-fee transactions to be temporarily rejected or delayed due to resource constraints. This strategy disrupts the normal flow of transactions and can cause significant user frustration.
Context
News regarding network congestion or unexpected transaction delays on blockchain networks sometimes points to Mempool Eviction Attacks. These attacks highlight vulnerabilities in transaction fee markets and mempool management mechanisms. Developers continually work on improvements to mempool policies and transaction prioritization to mitigate the impact of such adversarial actions.
A new class of Conditional Resource Exhaustion Attacks is formalized, exploiting Turing-complete execution to decouple validator work from fee compensation, fundamentally compromising blockchain liveness.
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