A free unofficial patch has been released to protect Windows users from all new PrintNightmare zero-day vulnerabilities discovered since June. Security researcher and Mimikatz creator Benjamin Delpy has been devising further vulnerabilities targeting the print spooler that remain unpatched. The 0patch service has released a free micropatch that can be used to fix all known vulnerabilities. Once installed, 0patch will automatically protect you from the printNightmare vulnerability and other bugs. The group policy-based workaround will block Delpy’s exploits as the print server will be blocked.
Source: https://www.bleepingcomputer.com/news/microsoft/new-windows-printnightmare-zero-days-get-free-unofficial-patch/