Layer-1 blockchain network Quebec halted operations on Sunday after an attacker allegedly exploited weakly crafted wallet seeds to withdraw nearly $1.4 million from more than 1,400 accounts, according to the project.
In a statement on X, Cubic said The network was halted at tick 85,371,949, where it remains. Stopped at the time of writing. Qubic said the vulnerability affected wallet tokens using any browser on iPhone or iPad, Safari on Mac until October 18, 2026, or the Qubic iOS app before July 2025, resulting in the theft of 2.94 trillion Qubit (QU).
“87.1 percent of the compromised funds never left the Cubic network and remained frozen in place,” Cubic said. “The remaining 12.9% was sent to MEXC, whose team froze the receiving account within about an hour.”
The Cubic theft is the latest in a string of attacks. Weak wallet seeds. In July, Cold Card Disclosure that the attackers had stolen funds from wallets whose seeds had been weakened by a firmware bug. Similar flaws affected TrustWallet’s browser extension and the Libbitcoin Explorer tool in 2023.
Related: Bitget’s $388M Hack Pushes Q3 Crypto Security Losses Past $1B
Cubic said he had. Fixed A seeding bug in the latest version of its web wallet.
A GitHub commit for version 4.26.4 shows that Qubic has replaced JavaScript’s Math.random() function, which is not suitable for generating cryptographic secrets, with the cryptographically secure crypto.getRandomValues() function when generating wallet seeds.
Quebec said its core team is identifying affected wallets and preparing recovery options for a vote by the network’s computers, which will decide what happens to the frozen funds. The team said it will publish a full technical report once the recovery plan is finalized. It has not announced when the network will resume.
Qubic did not immediately respond to Cointelegraph’s request for comment.
Cubic is a layer-1 blockchain that supports fee-free transactions and smart contracts. It is built on useful proof of work (UPoW) – a consensus mechanism that repurposes mining energy to train artificial intelligence. At the time of writing, the market capitalization of the Quebec token was approximately $62.6 million. According to That CoinGecko.
According to AMLBot, in the third quarter, 19% of cryptocrime cases were hacks and exploits but 40% reported losses. 2026 Investigative Reportwhich looked at 250 investigations launched since the start of the year.
Magazine: Richard Hart caught ‘off-guard’, Q-Day gets closer: Hodler’s Digest
