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 v3.5, the supported versions are:
- v2.7: Current LTS
 - v3.4: Prior release
 - v3.5: Current release
 
Please see our Security Vulnerability Reporting page for details on the process.