Base releases post-mortem report on network outage: User funds remain safe, root cause is a vulnerability in sequencer block construction logic.
2 hours ago
Base engineering team released a post-mortem report on the June 25 block production outage, noting that Base mainnet suffered two separate block production interruptions on June 25 and June 26. The first incident occurred at 11:47 ET on June 25, lasting 116 minutes; the second took place at 11:28 ET on June 26, lasting 20 minutes. Both events shared the same root cause. Chain integrity remained unharmed, and all funds on Base are secure. Block production resumed safely after the team mitigated the issues. The root cause was a bug in the sequencer’s block construction logic: after a transaction validation failure, expired log states were not cleared. An invalid transaction was received by the block builder and failed as expected, but the system incorrectly retained log states including accessed accounts and storage slots. A subsequent valid transaction was processed before the log states could be properly cleared, leading to a gas fee calculation mismatch and a sequencer block containing invalid state transitions. Other nodes rejected this block, causing the entire chain to halt. During the outage, Base could not produce new L2 blocks, sequencer and validator nodes could not advance past the invalid block, and new transactions could not be posted on-chain. The team fixed the interruptions by deploying a patch to the sequencer to ensure proper log state updates during execution. Base stated it will strengthen protocol fuzz testing and load testing tools to more easily identify adversarial transaction patterns that could expose similar vulnerabilities, and will continue to improve operational and monitoring capabilities.
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