Bitcoin
Coldcard Firmware Flaw Enabled $38M Bitcoin Theft
A hardware wallet vulnerability dating to March 2021 allowed attackers to drain around 500 wallets in minutes.
A firmware bug affecting Coldcard hardware wallets since March 2021 enabled an attacker to steal approximately 594 Bitcoin—worth $38 million—from roughly 500 wallets in just 25 minutes on 31 July 2026. The flaw made seed phrases guessable, potentially compromising the security of affected users' funds. Coldcard users should verify whether their devices were impacted and take steps to secure their holdings.
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