The Zephyr project supports the following versions with security updates:
- The most recent release, and the release prior to that.
 - Active LTS releases.
 
At this time, with the latest release of v4.0, the supported versions are:
- v4.0: Current release
 - v3.7: Prior release and Current LTS
 - v2.7: Prior LTS
 
Please see our Security Vulnerability Reporting page for details on the process.