The Sui mainnet experienced three consecutive outages between May 28 and 29, totaling over 15 hours of downtime. The Sui Foundation stated that user funds were unaffected during the outages and that submitted transactions were not rolled back.
Cause of the failure
Engineers traced the first two failures to a crash vulnerability caused by an interaction between the gas billing logic and Sui version 1.72. This version introduced an address balance feature, but the new functionality conflicted with the existing gas calculation process, causing validator nodes to stop running.
The foundation also acknowledged that, in order to restore the network as quickly as possible, the team implemented a temporary fix. This approach carried higher risks, and developers subsequently continued working on a more robust solution.
Prices are weakening in tandem.
SUI's price has declined significantly over the past week, dropping approximately 18% over seven days, and is currently trading at $0.86. On Monday, the broader crypto market retreated, with Bitcoin also falling to its lowest level in nearly two months, continuing to pressure SUI.
Reliability pressures remain
This is the third significant stability issue Sui has experienced since its mainnet launch in 2023. Previously, Sui encountered a transaction scheduling vulnerability in November 2024 and a consensus disagreement in January 2026, causing outages of approximately 2 hours and 6 hours, respectively.