Sui's mainnet is running again after a five-hour and 55-minute outage that started when a bug slipped into a network update. The blockchain's core team said the issue has been resolved, and transactions are now processing normally.
What caused the halt
The stoppage wasn't an external attack or a capacity overload. Investigators traced the root cause to a flaw in a routine software update. A bug introduced during the update triggered a chain reaction that forced validators to stop agreeing on new blocks. The network effectively froze until developers could roll back the faulty code.
Blockchain explorers show the first stalled block appeared at roughly 10:30 UTC. The final gap in block production lasted just under six hours — long enough to worry users who had pending transfers or smart-contract interactions.
How the team responded
Validators on the network coordinated through official channels to pause operations, apply a fix, and restart consensus. The Sui Foundation did not disclose the exact nature of the bug but confirmed that no user funds were lost and that the chain's state remained intact.
After the fix was deployed, mainnet resumed producing blocks at around 16:25 UTC. The total downtime of 5 hours 55 minutes is one of the longer interruptions for a major layer-1 blockchain this year.
What happens next
The team is expected to publish a post-mortem in the coming days. That report will likely detail the bug, explain why it passed initial testing, and outline measures to prevent a repeat. For now, the network is running on the corrected update, and traffic has returned to normal levels.
No deadline for the post-mortem has been announced, but stakeholders are watching closely — especially developers who deploy applications on Sui. The incident underscores how a single line of code in a network upgrade can ripple across an entire ecosystem.
