GHSA-423P-G724-FR39 CloudNativePG's metrics exporter allows privilege escalation to PostgreSQL superuser and OS RCE

Impact The CloudNativePG metrics exporter opens its PostgreSQL connection as the postgres superuser via the pod-local Unix socket, then demotes the session with SET ROLE pgmonitor. SET ROLE changes only currentuser; sessionuser remains postgres. That residual superuser identity is the foothold fo...