Prysm Bug Cost Ethereum Validators Over $1 Million After Fusaka Upgrade

Ethereum consensus client Prysm experienced a resource exhaustion event following the Fusaka upgrade on December 4, resulting in significant network disruptions. A bug introduced a month prior caused delays in validator requests, leading to missed blocks and attestations, ultimately costing validators 382 ETH, equivalent to over $1 million. The incident caused a 75% network participation rate, with 248 blocks missing out of 1,344 available slots across 41 missed epochs. Prysm developers have implemented permanent fixes to their attestation validation logic to prevent recurrence. The outage has renewed scrutiny on Ethereum's client diversity, as a bug in a client with a larger share could have caused more severe consequences, such as a temporary loss of finality.

(Source：BeInCrypto)