Antoine Riard, a developer of the Bitcoin Lightning Network, resigned last week due to critical vulnerability errors related to replacement cycling attacks. Despite this, the publicly viewable Lightning Network's total value locked has only decreased by 4% to 5,300 bitcoin ($180 million). However, there are unknown amounts in private Lightning networks between peers and institutions. Replacement cycling attacks are difficult to execute as they require a fluent understanding of the idiosyncratic Bitcoin Script programming language and interpersonal coordination.

A vulnerability in the Bitcoin Lightning Network called the replacement cycling attack could enable hackers to steal funds from forwarding nodes. The attack involves replacing a legitimate transaction with a nefarious one that does not include the shared UTXO, which is then broadcast directly to a mining pool operator to avoid detection. Although developers have released patches and updates to address the vulnerability, some experts warn that the fixes may not be sufficient to prevent a major theft of funds. Lightning Network users are advised to update their software to the latest version and remain alert.