The Sui Crypto Network has resumed normal operations following three consecutive halts that occurred between Thursday and Friday, May 28-29, 2026. According to the Sui Foundation's detailed post-mortem analysis, all outages were triggered by bugs in the 1.72 software release, with the first Mainnet halt running from approximately 7:00 a.m. to 1:30 p.m. PT on Thursday, followed by a second outage on Friday morning, and a third halt from roughly 1:30 p.m. to 7:20 p.m. PT Friday. The problem occurred when two transactions competed to spend from the same address balance simultaneously and one had to be cancelled, creating an underflow error where the gas charge did not respect the cancellation. This logic bug in the new payment routes interacting with SUI's gas-charging system caused the network to halt rather than record contradictory information.
SUI trades around $0.88 following the incident resolution, representing a 2.57% decline in the past 24 hours with a market cap of roughly $3.5 billion at rank 32. The token had previously fallen approximately 8% during the May 28-29 incident cascade, dropping from around $0.99 to a low near $0.86 as reported by the Sui Foundation. The price decline reflected trader reactions to what appeared to be a network in serious trouble. The outages occurred when the network would cancel payments for insufficient funds but still mark those funds as spent, creating negative balances that validators couldn't reconcile. The central tension revealed by these incidents is that while three halts in two days sounds catastrophic, it doesn't necessarily mean SUI is at risk, particularly given the network's positioning as one of the fastest Layer 1 networks in crypto.
According to the Sui Foundation's post-mortem analysis, the outages constituted a liveness failure rather than a safety failure. The network stopped moving forward but did not alter, erase, or expose existing balances or private keys. Exchange users were not at risk as exchanges typically suspend deposits and withdrawals during network disruptions, and self-custody wallet holders' assets remained safe throughout the outages. However, users with pending transactions or open DeFi positions experienced frustration as leveraged positions could not be managed and time-sensitive trades could not be executed. The incident highlights the fundamental nature of blockchain validators, where consensus failure can freeze the entire network regardless of underlying asset safety. As reported by the Sui Foundation, DeFi protocols on Sui experienced temporary disruptions but no permanent losses or mass liquidations occurred. According to DefiLlama data, Sui's total value locked sat at approximately $521-$542 million across 137 protocols, showing only minor fluctuations during the outage windows.
Following the outages related to the 1.72 release, the Sui Core Team completed an investigation and incident review, as detailed by the Sui Foundation's post-mortem analysis. The first emergency patch deployed to restore the chain carried a known probability of causing another halt, demonstrating the complexity of the bug resolution. The first outage began at roughly 7:00 a.m. PT on Thursday and lasted nearly seven hours, triggered by a newly introduced address-balance feature that created an uncommon interaction with Sui's existing coin objects. When a transaction was cancelled for insufficient funds, an underflow error caused validators to crash because the gas-charging routine still attempted to charge the same funds. The core team brought mainnet back up around 1:30 p.m. PT with an interim fix that addressed the most common manifestation of the bug but carried a known issue with a low probability of causing a halt. The second halt at about 5:00 a.m. PT on Friday was a masked variant where an insufficient-funds error was overridden by another cancellation reason, bypassing the interim patch. A more robust fix was completed and rolled out by roughly 9:40 a.m. PT. The third halt had a completely separate root cause, triggered when validators restarted to install Friday morning's fix, causing a six-hour delay as participation in the protocol that bootstraps Sui's on-chain randomness fell below the required threshold.
The Sui Core Team has outlined three areas for investment following the incident: strengthening end-of-epoch resilience, refactoring gas charging logic to make it more modular and testable, and building failure containment so a single bad input cannot halt the entire network. The incident follows Sui's earlier $10 million security commitment after the Cetus hack and underscores the ongoing scrutiny of Sui outages and the chain's ability to quickly resolve network bugs. This marked Sui's third major outage since its 2023 mainnet launch, following incidents in November 2024 and January 2026, as reported by CoinDesk. The episode underscores how subtle interactions between recently deployed features and legacy behavior can cascade into multi-stage outages on complex Layer-1 systems. Despite the recent challenges, the token had climbed 50% to $1.41 in early May after a Nasdaq-listed firm staked a large share of the supply, highlighting the network's potential despite reliability concerns. Whether the speed of this week's recovery and the transparency of the post-mortem shifts sentiment ahead of the next epoch upgrade remains to be seen.
