Sui (SUI) Mainnet has resumed regular operations after three separate community outages over two days, all tracing again to bugs launched within the latest 1.72 software program launch.
The Sui network mainnet halts occurred on Might 28 and Might 29, 2026, and briefly suspended all community exercise whereas validators coordinated fixes.
Sui Mainnet Outage: What the 1.72 Improve Broke
The primary 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 deal with balances.
A bug appeared when two transactions tried to spend from the identical deal with stability on the similar time, and considered one of them bought cancelled. Though the transaction was cancelled, the community nonetheless tried to debit the price. This resulted in an inconceivable destructive stability and crashed the system.
Validators adopted an interim repair to rapidly restore the community, however the crew acknowledged it had a recognized edge case. That edge case materialized Friday morning round 5 am PT. A unique error code overwrote the unique cancellation purpose and bypassed the guard, which triggered a second halt. The crew 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. Every 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.
Nonetheless, not sufficient of them participated on this course of, so it was disabled for that epoch. On account of a latent bug, nevertheless, that end result was by no means saved to disk. When validators restarted, that they had no reminiscence of the failed setup and stored ready for a outcome that might by no means come. Finish-of-epoch logic stalled, and the community halted a 3rd time.
All through all three incidents, the Sui Core Workforce 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’s down 2.57% up to now 24 hours, with a market cap of roughly $3.5 billion at rank 32.
The crew 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’t halt the complete community. The incident follows Sui’s earlier $10 million security commitment after the Cetus hack. It underscores the ongoing scrutiny of Sui outages and the chain’s capacity to quickly resolve network bugs.
Whether or not the pace of this week’s restoration and the transparency of the autopsy shifts sentiment forward of the subsequent epoch improve stays to be seen.
