Techub News said Coinkite, the developer behind the Bitcoin wallet Coldcard, shared new details on Aug. 20 about an asset outflow disclosed on July 30, 2026, and strongly advised users of the Mk4, Mk5 and Q models to upgrade their firmware immediately. Coinkite said the attack stemmed from a seed-generation vulnerability and that law enforcement is still investigating. Galaxy Research data put total losses at more than $110 million, making it the third-largest crypto theft of 2026. Coinkite also said the new firmware cannot make already compromised seeds safe, and users need to move funds to wallets created with new seeds.
Coinkite tells Coldcard users to update firmware
Coinkite, the developer of the Bitcoin wallet Coldcard, shared new information on Aug. 20 about an asset outflow event disclosed on July 30, 2026, Techub News reported. The company strongly urged users of the Mk4, Mk5 and Q models to upgrade their firmware immediately.
Coinkite said the attack came from a seed-generation vulnerability, and law enforcement is still investigating. The company also said the new firmware cannot improve the security of seeds that were already affected by the flaw. Users should move their funds to wallets created with new seeds.
Losses topped $110 million
Galaxy Research data showed that total losses linked to Coldcard exceeded $110 million. It was the third-largest crypto theft in 2026.
Source: CoinPost.
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