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Coldcard warns users to move Bitcoin from wallets made with vulnerable Mk3 firmware after 594 BTC sweep.

Market News
31 Jul 2026
Crypto news
View Source
Bearish
pluang ai news

Coldcard's maker Coinkite warned users on July 30 that Bitcoin wallets generated with Coldcard Mk3 firmware versions 4.0.1 through 5.0.3 may be at risk due to weak seed phrase generation. This alert followed a coordinated sweep of 594.48 BTC across 500 transactions, though no direct link between the firmware issue and the BTC movement has been confirmed. Coinkite recommends users generate new seeds on unaffected devices and carefully migrate funds, while investigations into the root cause continue. The company also noted that newer Coldcard models are not affected and advised using strong passphrases or dice-generated seeds as temporary safeguards.

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$38M stolen from Coldcard bitcoin wallets due to key generation flaw in firmware since 2021

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An attacker exploited a flaw in Coldcard hardware wallets' key generation, stealing about 594 BTC (worth $38 million) from around 500 wallets in under 30 minutes. The vulnerability, introduced in firmware version 4.0.0 in March 2021, caused the walle...

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