Sui’s 1.72 bugs caused three outages before foundation rolled out major fix

Sui said it has completed a major upgrade after three outages stopped its mainnet across two days, with the foundation saying known bugs have now been fixed.

The Sui Foundation said the outages happened on May 28 and May 29. The first started at about 7 a.m. PT on Thursday and ended at about 1:30 p.m. PT. The second ran from about 5 a.m. PT to 8:30 a.m. PT on Friday.

A third outage began at about 1:30 p.m. PT on Friday and ended at about 7:20 p.m. PT. “During the outages, no user funds were at risk,” Sui said, adding that the network did not reverse committed transactions after service resumed.

1.72 bugs and interim fix caused halts

Sui linked the first two outages to crash bugs tied to its 1.72 software release. The release introduced address balances, a feature that lets users store funds and pay gas without using coin objects.

The bug affected gas charging when some transactions failed because of low balances. Sui said the system could charge funds before canceling a transaction, creating negative balances that caused validators to crash.

The foundation said an interim fix helped bring the network back while the core team worked on a stronger solution. That temporary fix had a known low-probability issue that later caused another halt on Friday morning.

The third outage came at the next scheduled epoch change. Sui said a separate latent bug affected how validators preserved randomness state across restarts after they adopted the Friday morning fix.

Related coverage adds market context

As previously reported by crypto.news, Sui also suffered a six-hour outage on Jan. 14, 2026, after validators hit a consensus divergence bug. That earlier report said user funds stayed safe during the halt.

Separately, Sui had faced a major disruption in November 2024, when validators became stuck in a crash loop. In April, crypto.news reported that CME planned AVAX and SUI futures, adding regulated market access for institutions.

SUI price remains under pressure

SUI traded near $0.88 after the outages, based on market data. The token had traded near $0.99 before the first outage, leaving it lower after the network problems.

Sui continues to maintain an active DeFi ecosystem. According to DefiLlama, the network has hundreds of millions of dollars in total value locked. Following the outages, Sui said validators have addressed the known gas-charging and randomness-state bugs, and network activity has resumed.

The foundation also named better failure containment, stronger end-of-epoch handling, and more AI-assisted diagnostics as areas for future work.