Debian stable is just that - unchanging between major Debian versions. They do however push security updates when necessary, so you're not missing out on those
Any chance you know how they manage that? Surely not every package in the repos is supported for the entire 2 year cycle, so if a vuln comes out after a major refactor, it’s surely not easy to backport the patch.
They auto-import CVE feeds into the security tracker, file bugs for Debian maintainers to fix the issues, curate the tracking data, coordinate with upstreams and other distros to get fixes and so on. Some more on the team web page.
