A major exploit that has been around since Bitcoin core version 0.14.0 has finally been fixed after 18 months. No one has ever taken advantage of the exploit although the results of someone doing so could have been catastrophic as it would have potentially allowed the copying of coins and flooding the market with extra Bitcoins. The team has released full details of the exploit and encourages everyone to upgrade.
Bitmain has announced its 7nm chips which will drastically increase the number of transistors on the cheap and thus increase computational speed. Bitcoin has suffered losses in its Bitcoin cash investments and several failed chips this year and hopefully, this newest chip finally gets it right.