Sui official releases post-mortem of mainnet outage: Three major failures caused by upgrades, no confirmed transactions reverted

Odaily Planet Daily News: Sui Chinese official released a post-mortem of the mainnet outage, stating that between Thursday, May 28, and Friday, May 29, 2026, Pacific Time (UTC-7), the Sui mainnet experienced a total of three network failures. The first two failures originated from a crash bug caused by the interaction between the Gas charging logic and the recently released version 1.72 (which introduced the Address Balances feature). The fix deployed for Thursday's incident was a temporary patch aimed at restoring network operations as quickly as possible while the Sui core team developed a long-term solution. The team was aware that this temporary fix had a very low probability of causing network failures but accepted this risk to restore the mainnet promptly. On Friday morning, a different variant of this known issue was triggered, leading to another failure.

The third failure occurred during a routine Epoch transition on Friday afternoon. When validators restarted their nodes to deploy Friday morning's fix, a long-dormant bug in the random number state persistence was triggered, causing the network to fail again.

Timeline of failures: First: Started around 7:00 AM PT on Thursday, recovered at 1:30 PM PT; Second: Started around 5:00 AM PT on Friday, recovered at 8:30 AM PT; Third: Started around 1:30 PM PT on Friday, recovered at 7:20 PM PT.

User funds remained secure throughout the entire incident. No confirmed transactions were reverted after network recovery.

Currently, validators have fully patched the original Gas Charging and Randomness State vulnerabilities, and network activity has returned to normal.