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A total of 44 security flaws were fixed with the release of macOS Catalina 10.15.5, impacting components such as Accounts, AirDrop, Audio, Bluetooth, Calendar, ImageIO, Kernel, ksh, PackageKit, Sandbox, SQLite, USB Audio, Wi-Fi, and zsh, among others.
Eighteen of these vulnerabilities are specific to macOS Catalina, but many impact macOS High Sierra and macOS Mojave as well, and patches were released for those platform iterations as well.