Apple has released security updates to macOS Tahoe, bringing it to version 26.6.1, for Sequoia to 15.7.9, and for Sonoma to 14.8.9. The download size for 26.6.1 on Apple silicon is about 2.1 GB. Security release notes are available here for Tahoe, for Sequoia and Sonoma. They each refer to fixing a single vulnerability in Screen Sharing. mBoot firmware in Apple silicon Macs remains at version 18000.161.9, and the macOS build number for 26.6.1 is 25G76.