Ethereum Prysm Client Bug Leads to 25% Validation Participation Drop, Risking Finality

By: theblockbeats.news|2025/12/05 17:16:00

BlockBeats News, December 5th: Shortly after the Fusaka network upgrade, due to a bug in the Prysm consensus client, Ethereum's network validator participation rate dropped sharply, with a large number of voting nodes offline. Prysm's official announcement on Thursday stated that its v7.0.0 client unnecessarily generated an old state when processing outdated Attestations, causing nodes to malfunction. Developers recommended users to temporarily start the client using the "--disable-last-epoch-targets" flag as a workaround.

Beaconcha.in data shows that in Epoch 411,448, the network's sync participation and voting participation dropped to 75% and 74.7%, respectively. The voting participation decreased by 25%, falling just under 9 percentage points away from the supermajority of two-thirds (66.6%) needed to maintain network finality.

The magnitude of this voting participation decline roughly corresponds to the validator share of the Prysm consensus client, indicating that Attestation failures are likely concentrated in Prysm validators. Previously, Prysm's share had reached as high as 68.1%.

As of the time of writing, the current Epoch (411,712) of the Ethereum network has a voting participation rate close to 99% and a sync participation rate of 97%, indicating network recovery. Current MigaLabs data shows that Lighthouse still holds 52.55% of the consensus nodes, with Prysm coming second at 18%. Ethereum educator Anthony Sassano stated that if Lighthouse were to encounter this bug, the network would lose finality. (Cointelegraph)

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