Coldcard Hardware Wallet Flaw Exposes Testing Gaps, Security Expert Reports

A security flaw in Coldcard hardware wallets has been uncovered, exposing a gap in the testing processes used to verify hardware security. The issue was present for five years before detection and was missed because auditors only confirmed the presence of the intended random number generator (RNG), not that it was actively called during device operation.

The flaw was highlighted by security experts who pointed out that verifying the existence of a component does not ensure it functions correctly in practice. This oversight allowed the vulnerability to persist unnoticed for an extended period, potentially affecting users relying on Coldcard for secure storage.

The incident underscores the importance of comprehensive testing and verification procedures in hardware security, especially for devices used in safeguarding digital assets. It also raises questions about the adequacy of current auditing standards for hardware wallets and similar security devices.

Coldcard has not issued a public statement regarding the flaw, but the discovery may prompt a review of security testing practices across the industry. As hardware wallets are critical for many crypto users, ensuring their integrity remains a top priority for security professionals.