The Sui blockchain experienced three mainnet halts within 48 hours on May 28 and 29, traced to a bug introduced in the v1.72 upgrade. In a post-mortem published Sunday, the Sui Foundation said the outages stemmed from an edge case in the network's gas-charging logic.
The first outage began at approximately 7 a.m. PT Thursday and lasted nearly seven hours. It was caused by a rare issue when transactions used a new address-balance feature alongside traditional coin objects, triggering a validator crash.
The core team restored the network with an interim fix that carried a known low-probability risk. That risk materialized Friday morning, causing a second seven-hour outage when a transaction bypassed the patch.
A third halt occurred when validators restarted to install a more robust fix, dropping participation below the threshold for on-chain randomness. A latent bug then failed to persist the disabled state, stalling the next epoch change for nearly six hours.
The foundation confirmed no user funds were at risk and no committed transactions were reverted. SUI dropped approximately 8% during the cascade to $0.90, down 19% on the week.
This marks Sui's third major reliability incident since its 2023 mainnet launch, following a transaction scheduling bug in November 2024 and a consensus divergence in January 2026.