Key Highlights

  • Sui mainnet halted block production for nearly six hours on May 28, its second major stall in five months, triggered by a gas charging logic crash introduced in the 1.72 software release.

  • The SUI token declined approximately 8% during the outage as transaction finality froze across decentralized applications on the network.

  • Engineers identified the root cause within roughly 20 minutes and began rolling out a patch to validators, with full activity restored after nearly six hours of downtime.

Sui's mainnet went down on May 28, halting block production for nearly six hours in what the network confirmed as its second major stall in 2026. The outage began at approximately 2:29 p.m. UTC, with block explorers showing no new checkpoints being finalized as transactions queued across dApps without settlement.

The engineering team traced the failure to a bug introduced in version 1.72 of the network software. The defect corrupted the gas charging logic, causing a crash that prevented validators from reaching consensus and halting new checkpoint production across the entire mainnet. Engineers identified the issue within roughly 20 minutes of the stall beginning and immediately started distributing a fix to validator operators.

SUI fell roughly 8% during the downtime period as market participants reacted to the freeze on transaction finality. The network recovered after approximately five hours and fifty-five minutes, with validators completing the patch rollout and resuming normal checkpoint production by late afternoon UTC.

The incident follows a similar six-hour outage in January 2026, which was traced to an edge-case bug in consensus commit logic tied to conflicting transaction handling under specific garbage collection conditions. That earlier freeze prompted a v1.63.3 upgrade. Two validator-halting bugs within five months put Sui's consensus reliability under increased scrutiny as the network continues to attract significant total value locked across its DeFi ecosystem.