A bug in Ethereum's Nethermind client took down 8% of Ethereum's validators on January 21, raising concerns about Geth, which powers ~85% of the validators (Sam Kessler/CoinDesk)

Sam Kessler / CoinDesk:

A bug in Ethereum’s Nethermind client took down 8% of Ethereum’s validators on January 21, raising concerns about Geth, which powers ~85% of the validators  —  The lion’s share of Ethereum’s validators rely on the same piece of software to power their operations.  According to some experts, this could be a big risk.