What caused the recent Sui network outages?

The Sui Foundation said the outages were caused by software bugs introduced in the network's 1.72 update. The bugs created system crashes when certain transactions generated negative balances, forcing the blockchain offline multiple times.

Has Sui fixed the problems that caused the outages?

According to the Sui Foundation, validators have deployed a major upgrade that resolved both the gas-charging bug and the randomness-state bug. The foundation said network operations have resumed normally and all systems are currently operational.

Were any user funds lost during the Sui outages?

No. The Sui Foundation said no user funds were at risk during the incidents and no previously confirmed transactions were reversed when the network restarted.

What exactly went wrong in Sui's 1.72 software update?

The update introduced bugs that caused the network to charge transaction fees before cancelling transactions with insufficient balances. This created negative account balances, which triggered validator crashes and halted the blockchain.

Why did a third outage occur after the initial fix?

The temporary patch used to restore the network contained a known low-probability issue. While intended as an interim solution, it triggered another network halt before a permanent fix could be implemented.

How did the SUI token react to the outages?

The SUI token declined roughly 11% following the outages. Network disruptions often weigh on investor confidence because reliability is a key factor for blockchain adoption.

Does this outage damage Sui's long-term investment case?

The outages raise concerns about network stability, particularly for institutional users and developers. However, the long-term impact will depend on whether the fixes prove effective and whether Sui can prevent similar incidents in the future.

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Sui upgrade fixes bugs behind 15-hour outage

Q: How long was the Sui blockchain offline?

Sui experienced three separate outages over two days, resulting in more than 15 hours of downtime. The disruptions included a nearly six-hour outage on Thursday and two additional outages on Friday lasting more than eight hours and 43 minutes respectively.

Written by Isaac FrancisPublished Jun. 1 2026

The Sui Foundation said it has deployed a major network upgrade to address the software bugs responsible for three recent outages that left the blockchain offline for more than 15 hours across two days.

The disruptions included a nearly six-hour outage on Thursday followed by two additional outages on Friday lasting more than eight hours and 43 minutes respectively before services were restored.

“As of now, validators have fully addressed the known issues caused by both the original gas-charging bug and the randomness-state bug, and network activity has resumed,”

The Sui Foundation said.

According to the foundation, the first two outages were caused by crash bugs introduced in the network's 1.72 software update, which incorrectly charged transaction fees before cancelling transactions that lacked sufficient balances, creating negative account balances that crashed the system.

A temporary fix deployed to restore operations after the initial incident later triggered a third outage due to a known low-probability issue that caused another network halt.

The foundation said no user funds were placed at risk during the disruptions and confirmed that no previously committed transactions were reversed when the blockchain resumed operations.

Sui also identified several areas for improvement, including stronger failure containment, better end-of-epoch resilience and expanded use of artificial intelligence tools that assisted engineers in diagnosing issues and analysing validator data during the outages.

The incidents weighed on the price of the SUI token, which has fallen roughly 11% since the first outage, although the blockchain remains among the largest decentralised finance networks with approximately $519 million in total value locked across 137 protocols.

At the time of reporting, Sui price was $0.8792.