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Lounge Started Jul 31, 2026 12:56 AM

COLDCARD Bitcoin Storage Wallet Exploited [Attack Still Ongoing]

31 replies - 639 views - 3 thanks - 2 tippers - 10 watchers

Jul 31, 2026 12:56 AM
#1

https://xcancel.com/COLDCARDwallet/status/2082961993070247948

COLDCARD Mk3 Security Advisory. If you generated a seed on a Mk3 after firmware 4.0.1, your funds may be at risk. Mk4, Q and Mk5 are not affected based on our early analysis.Read the advisory and migrate carefully:

https://blog.coinkite.com/coldcard-mk3-seed-generation-warning/

The attack is ongoing and may effect other versions as well. It is definitely impacting people as there are multiple tweets I have seen from people who lost funds.

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Replies

Page 4 of 4 - 31 total
Aug 12, 2026 1:06 AM
#32

https://xcancel.com/BitcoinNewsCom/status/2087268151503597730

A new technical autopsy by @KLoaec finds some vulnerable COLDCARD Mk3 wallets may have been generated from just approximately 4.5 million possible RNG starting states, a space small enough to search in about 3 seconds on a single RTX 4090.

Even accounting for additional uncertainty about how each wallet was generated, they estimate an attacker could search the possibilities in about 50 minutes on a single high-end GPU.

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