The sequencer vulnerability caused two outages. Base's patch was fairly timely, but a graceful recovery mechanism is the long-term test.

Coin World News: Base has revealed the causes of two recent block production downtime incidents, attributing them to a sequencer vulnerability. Last week, Coinbase’s Layer 2 network Base experienced two block production downtime incidents, the root cause being a vulnerability in the sequencer’s block construction logic. This vulnerability allowed stale log states to persist after transaction validation failures, causing the sequencer and validator nodes to be unable to process invalid blocks until sequencing was restored. The first incident lasted 116 minutes, while the second lasted 20 minutes due to a race condition after a system reset that prevented the sequencer from keeping up with the pace. The team has since fixed the issue by applying a patch to the sequencer, with future plans to improve protocol fuzz testing and build a graceful recovery mechanism.