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Re:About speculative execution vulnerabilities in ARM-based ... by notadoc on Thursday January 04, 2018 @09:42PM (#16076077)
No, there is no macOS 10.12.7 release

https://support.apple.com/downloads/macos

Perhaps you're referring to a release on Dec 6 labeled as "Security Update 2017-002 10.12.6," which does not appear to include the Meltdown patch for Sierra.

Re:About speculative execution vulnerabilities in ARM-based ... by om2 on Friday January 05, 2018 @12:11AM (#16076712)
I might be super confused about versions, but security update 2017-002 Sierra claims to include the patch according to this page: https://support.apple.com/en-us/HT208331