Apple 0-dayed Safari on macOS Sequoia and Sonoma

I’m unaware of any explicit policy, but Apple’s long-standing practice is to release security updates for the latest three major versions of macOS. Currently, those are macOS 26 Tahoe, macOS 15 Sequoia, and macOS 14 Sonoma. On Monday, two days ago, Apple continued that practice by releasing macOS 26.5, 15.7.7, and 14.8.7. Another long-standing practice is to include Safari updates along with the latest major version of macOS but release Safari updates separately for the previous two major versions. Thus, Safari 26.0 was originally included along with macOS 26.0 back in September, and Safari 26.5 was included along with the macOS 26.5 update, whereas Safari 26.0 through 26.4 were separate updates for macOS 14 and 15. Originally, macOS 14.0 shipped with Safari 17.0 and macOS 15.0 with Safari 18.0. You can still run those older versions of Safari, though it’s inadvisable due to unpatched security vulnerabilities. You can see on the Apple security releases support page that Safari 26.4…