Svmuureported that Sui Chinese Official released a post-mortem of the mainnet outage, stating that on May 28 (Thursday) and May 29 (Friday), 2026, Pacific Time (UTC-7), the Sui mainnet experienced three network failures. The first two failures stemmed from a crash vulnerability caused by the interaction between the Gas charging logic and the recently released version 1.72 (which introduced the Address Balances feature). The fix for Thursday's incident was a temporary measure 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 an extremely low probability of causing network failure but accepted this risk to expedite mainnet recovery. On Friday morning, another variant of this known issue was triggered, leading to another failure.
The third failure occurred during the routine Epoch transition on Friday afternoon. When validators restarted nodes to deploy Friday morning's fix, a long-dormant defect in the Randomness State preservation was triggered, causing another network failure.
Failure timeline: First: Started Thursday around 7:00 PT, recovered at 13:30 PT; Second: Started Friday around 5:00 PT, recovered at 8:30 PT; Third: Started Friday around 13:30 PT, recovered at 19:20 PT;
Throughout the entire incident, user funds remained secure, and no confirmed transactions were reverted after network recovery.
Currently, validators have fully fixed the original Gas Charging and Randomness State vulnerabilities, and network activity has returned to normal.