According to TechFlow, Cointelegraph reported that Bitcoin security researcher and Bitcoin developer Antoine Riard withdrew from the development of the Lightning Network due to security issues and fundamental challenges facing the Bitcoin ecosystem.
Antoine Riard believes that “this new type of replacement cycle attack puts Lightning in a very dangerous situation, and only sustainable fixes can be made at the base layer, such as adding a memory-intensive history of all visible transactions or some consensus upgrades. The deployed mitigations are valuable in the face of simple attacks, although they do not prevent advanced attackers as stated in the first full disclosure email.”
The replacement cycle attack is a new type of attack in which attackers can exploit inconsistencies between various memory pools to steal funds from payment channel participants. He pointed out that solving the new type of attack may require changes to the underlying Bitcoin network. "These types of changes require maximum transparency and buy-in from the entire community because we are changing the full node processing requirements or the security architecture of the decentralized Bitcoin ecosystem."
