# Flaw in Coldcard Wallets Enables Major Bitcoin Theft

*Published August 3, 2026*
*Source: [https://www.bleepingcomputer.com/news/security/coldcard-wallet-rng-flaw-likely-linked-to-88-million-bitcoin-theft/](https://www.bleepingcomputer.com/news/security/coldcard-wallet-rng-flaw-likely-linked-to-88-million-bitcoin-theft/)*

## Executive Summary

A flaw in Coldcard's hardware wallet RNG has been linked to the theft of 88 million dollars in Bitcoin. Users are advised to update their firmware to protect their assets.

## Article

A critical flaw in the Coldcard hardware wallet's random number generator (RNG) has been identified as a key factor in an extensive Bitcoin theft operation. This vulnerability allowed attackers to execute rapid sweeps of Bitcoin wallets, leading to the theft of an estimated 88 million dollars in cryptocurrency. Coldcard, known for its robust security features, was compromised due to this flaw in its RNG and firmware. The flaw enabled attackers to predict wallet private keys, granting them unauthorized access to user funds. The breach underscores the importance of rigorous security testing and validation in hardware cryptocurrency wallets. Affected users are advised to update their devices with the latest firmware patch released by Coldcard to mitigate further risks. Security teams emphasize the need for continuous monitoring and testing of cryptographic components to prevent similar incidents in the future.