Sui Blockchain Suffers Second Major Network Outage in Five Months

May 28, 2026

The Sui blockchain network, developed by Mysten Labs, experienced a major outage on May 28, 2026, halting block production for nearly three hours. This marks the second significant outage for the layer 1 network in 2026. The Sui Core team had not disclosed the cause at press time. The SUI token declined 8% in the 24 hours preceding the outage.

Sui network outage

▪The Sui network mainnet stalled on May 28, 2026, temporarily halting transaction processing.
▪The Sui Core team had not disclosed the cause of the May 28, 2026 network outage at press time.
▪The May 28, 2026 Sui network outage is the second outage the Sui network has experienced in 2026.

Sui blockchain background

▪Mysten Labs developed the Sui network.
▪The Sui blockchain launched in 2023.
▪The Sui blockchain is a layer 1 blockchain that competes with Ethereum and Solana by offering high-speed transactions and low fees.

SUI token price impact

▪The SUI token price declined 8% in the 24 hours preceding May 28, 2026, 4:11 p.m.
▪Broader crypto market conditions were mixed on May 28, 2026.

Blockchain reliability concerns

▪Blockchain outages are a closely watched issue for traders and developers, particularly for networks marketed as high-performance infrastructure for decentralized finance and gaming applications.
▪The Sui blockchain has previously faced periods of degraded performance and outages.