Zimbra Collaboration 8.8.8 Patch-10 has been issued on 14 September 2018.
With 8.8.8 Patches, customers do not need to download any Zimbra Collaboration Patch builds. Patch packages can be installed by using Linux package management commands. Please refer to the release notes for Zimbra 8.8.8 Patch-10 installation on Redhat and Ubuntu platforms. Release Notes