Sui Mainnet Back Online After 3 Outages Triggered by Software Upgrade Bugs
Sui (SUI) Mainnet has resumed regular operations after three separate community outages over two days, all tracing again to bugs launched within the current 1.72 software program launch.
The Sui network mainnet halts occurred on May 28 and May 29, 2026, and quickly suspended all community exercise whereas validators coordinated fixes.
Sui Mainnet Outage: What the 1.72 Upgrade Broke
The first outage started round 7 am PT on Thursday and lasted till roughly 1:30 pm PT. The 1.72 launch launched a brand new means for customers to pay transaction charges utilizing so-called handle balances.
A bug appeared when two transactions tried to spend from the identical handle steadiness on the identical time, and one in every of them acquired cancelled. Even although the transaction was cancelled, the community nonetheless tried to debit the payment. This resulted in an not possible damaging steadiness and crashed the system.
Validators adopted an interim repair to shortly restore the community, however the workforce acknowledged it had a identified edge case. That edge case materialized Friday morning round 5 am PT. A special error code overwrote the unique cancellation cause and bypassed the guard, which triggered a second halt. The workforce deployed a extra full repair by 8:30 am PT.
A Hidden Bug Caused a Third Halt at Epoch Change
The third outage, from roughly 1:30 pm to 7:20 pm PT on Friday, had a separate trigger. Each time Sui strikes into a brand new epoch, validators run a setup course of. This course of generates a shared random worth used by sure transactions. Validators restarted to undertake the Friday morning repair.
However, not sufficient of them participated on this course of, so it was disabled for that epoch. Due to a latent bug, nonetheless, that end result was by no means saved to disk. When validators restarted, they’d no reminiscence of the failed setup and stored ready for a outcome that will by no means come. End-of-epoch logic stalled, and the community halted a 3rd time.
Throughout all three incidents, the Sui Core Team confirmed that no consumer funds have been in danger and the community didn’t revert any beforehand confirmed transactions. The SUI token price trades round $0.88. It is down 2.57% prior to now 24 hours, with a market cap of roughly $3.5 billion at rank 32.
The workforce has since outlined three areas for funding: strengthening end-of-epoch resilience, refactoring fuel charging logic to make it extra modular and testable, and constructing failure containment so a single dangerous enter can not halt all the community. The incident follows Sui’s earlier $10 million security commitment after the Cetus hack. It underscores the (*3*) and the chain’s capability to quickly resolve network bugs.
Whether the pace of this week’s restoration and the transparency of the autopsy shifts sentiment forward of the following epoch improve stays to be seen.
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