Qubic blockchain halts operations after $1.4 million crypto theft

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Eugene Komchuk

19.10.2026

Qubic blockchain halts operations after $1.4 million crypto theft — Another blockchain falls victim to a hack

The layer-1 blockchain Qubic has suspended operations following a hacker attack that resulted in the theft of approximately $1.4 million in cryptocurrency. More than 1,400 wallets were affected, with the breach caused by a vulnerability in the mechanism used to generate seed phrases for accessing funds.

According to the Qubic team, the network was halted at tick 85,371,949 (a transaction processing cycle). Developers took this step to prevent further movement of the stolen assets and investigate the incident.

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According to the project, the issue affected users who created wallets through browsers on iPhones and iPads, as well as through Safari on Mac computers before October 18, 2026. The vulnerability was also present in the Qubic iOS app before July 2025.

The flaw involved the use of an insufficiently secure random number generator when creating seed phrases. This potentially allowed attackers to reconstruct the phrases and gain access to users' wallets.

In total, hackers stole 2.94 trillion Qubit (QU) tokens. However, 87.1% of the stolen funds remained within the Qubic network and were frozen. The attackers transferred the remaining 12.9% to cryptocurrency exchange MEXC, which froze the receiving account within approximately an hour.

Developers have already fixed the vulnerability in version 4.26.4 of the web wallet. The JavaScript Math.random() function, which does not provide sufficient cryptographic security, has been replaced with the more secure crypto.getRandomValues() function.

When will Qubic resume operations?

The project team continues to identify affected wallets and develop a recovery mechanism. Potential solutions will be put to a vote among network participants known as Computors, who will decide what happens to the frozen assets.

No exact date has been announced for the blockchain's restart. Once a recovery plan has been agreed upon, developers have promised to publish a detailed technical report on the incident.

Qubic is a layer-1 blockchain that supports feeless transactions and smart contracts. The network uses a consensus mechanism called Useful Proof of Work (UPoW), which allows miners' computing power to be used for artificial intelligence training. At the time of the original report, the QU token had a market capitalization of approximately $62.6 million.

Other blockchains that have halted operations

Qubic is not the only blockchain that has been forced to suspend operations due to security threats. In late August 2026, Cronos, a blockchain associated with cryptocurrency exchange Crypto.com, halted transaction processing following an attack on the Tectonic lending protocol. The attacker manipulated the price of the TONIC token, with the scale of the attack initially estimated at approximately $75 million. Crypto.com itself was not affected.

In November 2025, Berachain validators also halted the network following a major exploit of the Balancer V2 protocol that affected several blockchains. Developers carried out an emergency upgrade to address the vulnerability and prevent further losses. Total losses from the attack on Balancer and related protocols were estimated at approximately $128 million.

However, blockchain outages are not always caused by hacker attacks. In May 2026, the Sui network stopped processing transactions three times over two days due to software bugs following an upgrade. Unlike the incidents involving Qubic and Cronos, these disruptions were technical in nature and did not result in users losing funds.

As a reminder, Kraken suspended Monero deposits after the Qubic mining pool gained control of the majority of the network's hashrate.

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