Prysm Team Releases Post-Mortem Report on Resource Exhaustion Incident During Fusaka Upgrade

Chainthink

Release Time:12/14/2025 03:50:45

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On December 14, the **project team** behind Prysm released a post-mortem report on a resource exhaustion incident during the Fusaka **upgrade** on Ethereum mainnet on December 4. Nearly all beacon nodes failed to process certain attestations, causing validator requests to stall and leading to 248 missed slots across 42 epochs. Participation dropped to 75%, with validators losing 382 ETH in rewards. The issue stemmed from out-of-sync nodes referencing old block roots, triggering costly epoch transitions. A temporary fix was deployed in v7.0.0, with full solutions in v7.0.1 and v7.1.0.

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