The Sui blockchain suffered its second major outage of 2026 on Thursday, going offline for just under six hours after a bug crept into one of its software updates. The SUI token took an immediate hit, falling sharply before clawing back some of its losses.
The problem started with the network’s 1.72 release. A bug in the gas charging logic caused the mainnet to crash and halt all transaction processing. The Sui team confirmed the issue on X, stating activity had stopped due to “a halt due to a crash bug in the gas charging logic introduced by the 1.72 release.”
Sui Mainnet is currently experiencing a network stall. The Sui Core team is actively working on a solution.
Be aware that transactions may be paused at this time. Updates will be shared as soon as they are available.
— Sui (@SuiNetwork) May 28, 2026
The network first alerted users to a “network stall,” warning that transactions could be paused while a fix was developed. It took nearly six hours — 5 hours and 55 minutes exactly — before the mainnet came back online. Even after the restart, validators were still reported to be running at degraded performance.
The market responded quickly. SUI dropped around 6.6%, falling to a low of $0.90 during the outage, according to CoinGecko data. The token partially recovered and was trading near $0.93 as of early Friday.
The drop came just weeks after a strong run for the token. Earlier in May, SUI had surged roughly 50% to $1.41 on the back of several positive developments, including a Nasdaq-listed company staking a large share of the supply.
Developers had also announced upcoming features, including zero-fee stablecoin transfers and private transactions. Co-founder Adeniyi Abiodun of Mysten Labs, the team behind Sui, reiterated those plans at Consensus 2026.
Thursday’s incident was not an isolated event. In January 2026, the Sui network was also taken offline for more than six hours. Before that, in November 2024, all validators became stuck in a crash loop for around two and a half hours.
This marks the third recorded disruption to the Sui blockchain in the past two years.
Despite the outages, Sui remains a major player in the blockchain space. According to DeFiLlama, it ranks 13th by total value locked, securing around $542 million across 137 protocols.
Sui launched its mainnet in May 2023 with a focus on speed and scalability for financial institutions. The team said a full post-mortem review of the latest outage would be shared in the coming days.
Validators were still listed as showing degraded performance shortly after the network came back online.
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