Note: "Libbitcoin" here is a company name, and not a name of the core bitcoin library.
Only their products and whoever used them as a 3rd party is affected.
libbitcoin isn't a company. It's an alternative C++ implementation (https://github.com/libbitcoin) to the Bitcoin Core (https://github.com/bitcoin/bitcoin) implementation. Bitcoin Core is the one originally from Satoshi. Libbitcoin came in like 2011 or so iirc and was led by Amir Taaki. Libbitcoin is a lot less popular than Bitcoin Core, as you can see on the github stats.