Critical

COLDCARD Seed Generation Flaw Linked to Nearly $89 Million Bitcoin Theft

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August 3, 2026 at 5:52 PM

Actively Exploited

Overview

According to Galaxy Research, a Bitcoin theft involving 1,367.05 BTC, valued at nearly $89 million, has been linked to weaknesses in seed generation by COLDCARD devices. The issue arises from the way these devices generate cryptographic seeds, which are crucial for securing Bitcoin wallets. Coinkite, the company behind COLDCARD, has stated that existing users cannot fix seeds that were generated before updates were implemented. This situation raises significant concerns about the security of users' funds, as those with affected devices may still be at risk of theft. The incident underscores the importance of regular updates and secure seed generation practices for cryptocurrency users.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: COLDCARD devices and their seed generation feature
Action Required: Users are advised to update their COLDCARD devices, but existing seeds generated prior to the updates cannot be repaired.
Timeline: Newly disclosed

Original Article Summary

Galaxy Research linked a suspected Bitcoin theft of 1,367.05 BTC to weak COLDCARD seeds. Coinkite says updates cannot repair seeds already generated on devices.

Impact

COLDCARD devices and their seed generation feature

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Newly disclosed

Remediation

Users are advised to update their COLDCARD devices, but existing seeds generated prior to the updates cannot be repaired.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

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