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Ethereum Foundation Flags Prysm Consensus Client Issue on Mainnet

Ethereum Foundation Flags Prysm Consensus Client Issue on Mainnet

A Prysm client bug after Ethereum’s Fusaka upgrade temporarily reduced validator participation to 74.7%, but a swift fix restored network performance to 99% within hours.

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Summary

On December 5, Ethereum validator participation fell to 74.7% due to a Prysm consensus client bug following the Fusaka upgrade. Developers recommended disabling the last epoch targets flag as a temporary fix, which restored participation to 99% by Epoch 411,712. Lido, using Prysm for part of its validators, saw stable operations during the incident, with some nodes switching to alternative clients until the issue was resolved. Other Ethereum clients remained unaffected.

Terms & Concepts
  • Prysm consensus client: A software implementation of Ethereum’s consensus layer used for validating blockchain transactions and blocks.
  • consensus layer (CL): The part of the Ethereum network responsible for block validation and agreement among nodes.
  • Fusaka hard fork: A network upgrade on Ethereum introducing changes to its protocol, requiring nodes to update their software to remain compatible.