Blockstream engineer Rusty Russell, who developed most of the Lightning Network's protocols, announced on September 1st: "A security issue that could lead to financial losses has been discovered in various lightning network projects. All details will be announced within four weeks. Please upgrade in advance." Official issues related to the Lightning Network will be disclosed to users on September 27. As of press time, the main problem seems to come from the bitcoin wallet Éclair. Russell told all users that these wallets should be updated quickly.