The Qubic Blockchain Has Halted Operations Following the Hack of 1,400 Wallets

• Qubic reported the theft of about 2.94 trillion QU from 1,404 wallets between October 17 and 18, 2026.
• According to the team, the cause was insufficient randomness during the generation of part of the seed phrases, not a vulnerability in the protocol itself.

The Qubic L1 blockchain reported the theft of about 2.94 trillion QU from 1,404 wallets. The incident occurred on October 17–18, 2026.

According to the team’s statement, the attacker exploited insufficient randomness during the generation of some seed phrases, which made it possible to gain access to the corresponding wallets. Qubic emphasized that the issue was related to seed phrase generation, not the protocol itself.

Qubic halted the network and froze funds

Computors (Computors) coordinated a network halt at tick 85 371 949. As a result, transactions are not being processed, and the stolen assets cannot be transferred or sold until the situation is resolved, the statement said.

According to Qubic, 87.1% of the stolen funds remained on the network and were frozen. The remaining 12.9% was transferred by the attacker to the MEXC crypto exchange. The project team said the exchange froze the recipient’s account within about an hour. Other exchanges were also notified and suspended QUBIC deposits and withdrawals.

The team clarified that the risk applies to seed phrases created in certain environments before October 18, 2026:

• on an iPhone or iPad in any browser
• on a Mac via the Safari browser

Seed phrases created in the Qubic iOS app before July 2025 may also be at risk.

Qubic said it fixed seed phrase generation in version 4.26.4. According to the team, creating new weak seed phrases is now impossible. A final decision on next steps must be made by a quorum of computors in accordance with the network rules. 

The core team is identifying all affected addresses and preparing solution options for review. A poll was also opened on Discord so computors can take the community’s position into account.

For users who lost funds, the team recommends contacting the police or cybercrime authorities in their country. The report should include the wallet identifier, the amount lost, and a link to the transaction in the Qubic explorer.

The project warned about possible scam attempts disguised as help with recovering funds. According to the team, its representatives do not message users first, do not ask for seed phrases, and do not offer paid services to recover assets.

Qubic has promised to publish a full technical report after the recovery process is completed.

As a reminder, losses from cryptocurrency hacks in September reached $766 million.

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