Sui Mainnet Went Down Three Times in 48 Hours. What Actually Happened?


 Sui's mainnet experienced three separate outages between May 28 and May 29, 2026. Most of the coverage you've seen probably leads with the downtime number and stops there. The actual story is more technical and more telling.

The first outage traced back to Sui's 1.72 release, which introduced address balances as a new way to pay for gas. A flaw in how gas smashing interacted with cancelled transactions caused a negative balance delta and a node crash. Validators were offline from around 7am PT to 1:30pm PT on Thursday.

The fix worked, but it had a known edge case. The Sui Core Team accepted that risk to restore the network quickly while building a more complete solution.

That edge case showed up Friday morning at 5am PT. A different error code masked the cancellation flag the Thursday fix was looking for. The same underflow happened through a different path. The network went down again.

The robust fix was already close to done. Validators adopted it by 9:40am PT.

Then came the third outage. When validators restarted to take the Friday fix, the distributed key generation protocol for the next epoch failed due to insufficient participation. That was expected behaviour. What wasn't expected: the failure result was never written to disk. Validators restarted again not knowing DKG had failed. Randomness-dependent transactions queued up waiting for something that would never come. End-of-epoch logic got stuck waiting on that queue.

A two-part patch, persisting DKG state across restarts and adding a force-close mechanism for stuck epochs, resolved it by 7:20pm PT on Friday.

No user funds were at risk at any point. No transactions were reversed.

The Sui Foundation published a full post-mortem covering all three incidents, the root causes, the fixes applied, and the areas they plan to invest in going forward. If you are building on Sui or holding SUI tokens, the full breakdown is worth reading.

For the complete technical analysis and what this means for Sui's architecture going forward, read the full article at CryptoNewsLive.org. 

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