Sui Foundation has published an incident review detailing three separate mainnet outages that struck the network on May 28 and May 29, 2026, attributing the disruptions to software bugs introduced after a recent protocol upgrade.
What Sui disclosed in its incident review
The May 31 postmortem confirmed that no user funds were at risk during any of the three incidents and that no committed transactions were reverted when service resumed. The review attributed the first two outages to crash bugs involving gas-charging logic introduced with the 1.72 release, while the third stemmed from a separate validator randomness-state bug exposed during restarts.
Timeline of the three May 28-29 mainnet outages
The first outage began at approximately 7:00 a.m. PT on Wednesday, May 28, and lasted until roughly 1:30 p.m. PT, a window of about six and a half hours. Validators encountered a crash triggered by the gas-charging logic changes shipped in the 1.72 release.
A second incident followed early the next morning, running from approximately 5:00 a.m. PT to 8:30 a.m. PT on Thursday, May 29. The root cause was the same category of gas-charging bug, indicating that the initial fix had not fully resolved the underlying issue.
The third and final outage hit later that same day, from roughly 1:30 p.m. PT to 7:20 p.m. PT. This time the trigger was distinct: a validator randomness-state bug that surfaced when nodes were restarted as part of the recovery from the earlier incidents.
Third-party infrastructure providers corroborated the disruptions. QuickNode’s public incident history recorded Sui Mainnet stalls on both days, plus a later May 29 epoch-change incident during which user transactions were not being accepted. Newton, a Canadian exchange, posted a notice on May 29 stating that SUI withdrawals were temporarily suspended because of an issue with the SUI blockchain, though trading remained enabled.
The downstream exchange impact mirrors a pattern seen across the broader crypto market this year, where infrastructure disruptions and macro headwinds have compounded pressure on token prices and user confidence.
What the review means for Sui users and next steps
The incident review stated that all three outages have been resolved and that fixes were rolled out across May 28 through May 30. Sui’s official status page confirmed the network came back online after each incident, with the final restoration completing on the evening of May 29.
Sui Foundation’s decision to publish a detailed postmortem within two days of the final outage signals an effort toward operational transparency. The review separated the two distinct bug categories, gas-charging crashes and the randomness-state flaw, rather than grouping them under a single cause.
The episodes raise open questions about the testing and staging process for mainnet releases. Two of the three outages traced back to the same 1.72 upgrade, suggesting the gas-charging changes were not caught in pre-production validation. The third bug, exposed only during restart procedures, points to edge cases in validator state management that standard testing may not cover.
For ecosystem participants, the practical takeaway is that transaction finality was preserved. No committed transactions were lost or rolled back, which limits the blast radius for DeFi protocols and applications built on Sui. That said, the cumulative downtime, roughly 20 hours across the two days, is significant for a network positioning itself as high-performance infrastructure.
SUI was trading at $0.8884, down about 3.0% over 24 hours at the time of writing. The broader crypto market sentiment sits in “Fear” territory, with the Fear and Greed Index at 29.
Network reliability incidents increasingly carry regulatory weight. Jurisdictions examining crypto infrastructure, including those applying traditional financial oversight frameworks to blockchain networks, may view repeated mainnet halts as material operational risk. As crypto’s influence on policy and elections grows, accountability standards for major Layer 1 networks are likely to tighten.
The Sui Foundation has not announced a revised release schedule or additional safeguards beyond the patches already deployed. Validators and application developers will be watching the next protocol upgrade closely for signs that the testing pipeline has been strengthened.
Disclaimer: This article is for informational purposes only and does not constitute financial or investment advice. Cryptocurrency and digital asset markets carry significant risk. Always do your own research before making decisions.
