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Hackers exploit Coldcard firmware flaw, stealing $89 million in Bitcoin from thousands of wallets

Hackers exploited a 2021 Coldcard firmware bug to steal 1,367 BTC worth $89 million across 4,585 wallets in multiple coordinated attack waves.

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cryptobriefing.comStai leggendo22 h fa

Hackers exploit Coldcard firmware flaw, stealing $89 million in Bitcoin from thousands of wallets

Coldcard firmware bug (versions 4.0.1–4.1.9) substituted software for hardware RNG in seed generation, enabling $89M theft from 4,585 addresses (July 2026). Self-custody risk now extends to firmware integrity; BIP-39 passphrases and supply-chain audits essential.

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Timeline cronologica

venerdì 31 luglio 2026·coindesk.com
Major bitcoin wallet flaw drains 594 BTC in 25-minute sweep
A hardware wallet randomness bug turned “impossible to guess” seeds into guessable ones, and $38 million is already gone.
venerdì 31 luglio 2026·decrypt.co
$38M in Bitcoin Drained by Coldcard Key Flaw Its Maker Thinks AI Found - Decrypt
Coinkite said it’s likely that an attacker used AI to review previous versions of its open source firmware to uncover a vulnerability.

Hackers exploit Coldcard firmware flaw, stealing $89 million in Bitcoin from thousands of wallets

Confronto fonti

Hackers exploit Coldcard firmware flaw, stealing $89 million in Bitcoin from thousands of wallets

Timeline cronologica

Major bitcoin wallet flaw drains 594 BTC in 25-minute sweep

$38M in Bitcoin Drained by Coldcard Key Flaw Its Maker Thinks AI Found - Decrypt

Coldcard hack steals $86 million in bitcoin from more than 4,500 wallets

A Coldcard firmware flaw let hackers drain $70 million in Bitcoin in 41 minutes, with losses now topping $88…

Hackers hit Bitcoin’s safest hiding place in ongoing attack

Coldcard Hardware Wallet Flaw Linked to $70 Million Bitcoin Theft in 41 Minutes

Hackers hit Bitcoin’s safest hiding place in ongoing attack - The Economic Times

Coinkite reports $38M in Bitcoin drained due to Coldcard key generation flaw

Coldcard Wallet Flaw Exposes Years Of Bitcoin Seeds After $70M In BTC Stolen

Coldcard exploit reignites Bitcoin self-custody debate after $38 million theft

Coldcard Bug Exposes The New Reality: AI Is Auditing Every Open-Source Wallet

Bitcoin losses linked to Coldcard vulnerability grow to $70 million, Galaxy Research says

Coldcard Bitcoin Thief Likely Used Top Blockchain Services Provider

Coldcard Attacker Stole $30M in 10 Minutes by Targeting Big Wallets

Block traces COLDCARD attacker to blockchain services provider after $38M Bitcoin theft

The Coldcard Exploit Explained: Who Lost Bitcoin and Who's at Risk

How bitcoin cold wallets lost $70 million in an attack that never touched the devices

Was AI Responsible for Finding the Coldcard Security Flaw?

Binance's CZ warns users to split funds after $70M Coldcard exploit

Coldcard Hardware Wallet Flaw Linked to $70 Million Bitcoin Theft in 41 Minutes

Bitcoin cold-wallet attack spreads to 4,500 addresses as losses near $89 million

Galaxy Research identifies 1,367 BTC drained in attacks on Coldcard addresses

"Nothing Is 100%": CZ Warns Bitcoin Holders After $89 Million Coldcard Wallet Exploit

Coldcard Bitcoin Exploit Balloons to $88 Million as Attackers Keep Draining Wallets - Decrypt

A Coldcard firmware flaw let hackers drain $70 million in Bitcoin in 41 minutes, with losses now topping $88 million