Today we've released "Patch 2" for ArcGIS Runtime SDK 10.2.6 for Qt. This patch addresses the following stability and security issues with ArcGIS Runtime SDK 10.2.6:
An API libpng dependency fix to address security vulnerabilities, which allows ArcGIS Android apps that are published to the Google Play store to be updated and any new published apps to comply with Google Play's Malicious Behavior policy. You can read more about this vulnerability in CVE-2015-8540.
A fix for BUG-000096913: Edits from mobile geodatabases that contain empty geometry fail to synchronize.
A fix for QML apps built with Qt 5.6.0 running on iOS 8.4 devices. These apps were crashing.
Go here for more information and instructions for downloading the patch.