At least 15 different attackers have exploited a vulnerability in Coldcard hardware wallets. Dragonfly's managing partner says the flaw could have been avoided with just $2 worth of AI hardening. The exploit has already been used multiple times, raising questions about the security of the popular cold storage device.
The vulnerability and its exploitation
Details on the exact nature of the vulnerability remain scarce. What is known is that at least 15 distinct attackers have successfully exploited it. That number suggests the flaw was not obscure — it was findable and usable by a range of bad actors. Coldcard wallets are designed to keep cryptocurrency keys offline, but this breach shows that even air-gapped devices can have weak points.
The attackers likely targeted users who store significant amounts of crypto. Hardware wallets are marketed as the gold standard for security. This incident chips away at that reputation.
A $2 fix that wasn't applied
Dragonfly's managing partner pointed to a simple solution. He said the vulnerability could have been prevented with just $2 worth of AI hardening. That's a tiny cost compared to the potential losses from a successful attack. The comment suggests that the flaw was not a deep architectural issue but a surface-level oversight that automated testing could have caught.
AI hardening refers to using machine learning to probe for weaknesses during development. It's a relatively cheap add-on to existing security testing. For a product that costs hundreds of dollars, skipping a $2 safeguard looks like a serious misstep.
What this means for Coldcard users
Anyone using a Coldcard wallet should be concerned. The exploit has been used at least 15 times, and it's not clear if the company has patched it yet. Without a fix, users' funds remain at risk. The managing partner's statement implies that the vulnerability was preventable — and that the cost of prevention was negligible.
Coldcard has not publicly commented on the timeline for a patch. Users are left to wonder whether their device is still vulnerable. The incident also puts pressure on other hardware wallet makers to review their own security testing practices.
The exploit was not sophisticated. It could have been stopped by a $2 investment in AI hardening. Instead, at least 15 attackers got through.
