Samsung has officially stopped rolling out monthly security updates for the Galaxy Note 5 and the S6 edge+, so these new models would no longer get any such improvements in the coming months.
As part of monthly security updates, Samsung rolls out fixes for the security vulnerabilities discovered in the Android operating system and the core apps.
Needless to say, without such updates, users of the Galaxy Note 5 and the S6 edge+ would remain vulnerable to any potential attacks, which makes the switch to another supported device strongly recommended.
News of Samsung dropping supported for these two models was shared as part of the September 2018 security patch, which the company should begin shipping to its models these days. In the release notes, the company published the list of supported models to get the new security patch, and both the Note 5 and the S6 edge+ are missing.