In the build from today, the security update from 5.12.2020 is present. Build has just been completed, packaged and is uploading now.
PLATFORM_SECURITY_PATCH := 2020-12-05
eOS-Q-20201215-UNOFFICIAL-treble_arm64_avS.img.xz
eOS-Q-20201215-UNOFFICIAL-treble_arm64_bvS.img.xz