A flaw in certain Coldcard firmware versions reportedly let weak seed phrases slip through, and the fallout is ugly: more than 1,367 BTC has been drained from thousands of addresses. Updating firmware helps going forward — but old vulnerable seeds are still fair game.
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A Coldcard seed-generation flaw may have helped drain an estimated 1,367 BTC, worth about $88.6 million, across thousands of addresses. Users are being urged to create fresh seeds and move funds, since a firmware update won’t fix an already compromised wallet.
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Galaxy Digital says a Coldcard firmware bug may have weakened seed generation and exposed Bitcoin holders to roughly $70 million in theft. Coinkite has patched the flaw, but affected users still need to create new seeds and move funds — because an updated wallet does not fix a tainted one.
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Block says flaws in several Coldcard hardware wallets may have exposed over 1,082 BTC to theft, with the problem tied to weak wallet generation rather than a later device hack. Users of affected models are being urged to move funds to fresh, verified wallets fast.
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