Sui Network suffers two‑day mainnet outage after upgrade bug, token drops 8%

The Sui Network's mainnet was halted for two consecutive days in late May 2026 after a bug in the v1.72 upgrade. The upgrade introduced an "Address Balances" feature that conflicted with the new gas billing logic, causing validators to crash and stop processing user transactions. The first outage began on May 28 and lasted nearly six hours; subsequent crashes on May 29 and May 30 extended the downtime, freezing roughly $1 billion in on‑chain assets.

No user funds were lost, and validators restored full block production by May 30 through emergency fixes and a corrected software version. The repeated halts pushed the SUI token down about 8%, dropping below $0.89 and triggering roughly $2 million in liquidations of long positions. The incident follows weeks of rapid adoption, including institutional staking and a partnership that had driven an 18% price surge, raising questions about the network's upgrade testing and resilience.

The Sui team plans to publish a post‑mortem and assess how to improve its upgrade pipeline to prevent similar outages, while the broader blockchain community watches how quickly the protocol can restore confidence among builders, validators, and DeFi users.