PostgreSQL Vulnerability - CVE-2023-5870

A flaw was found in PostgreSQL involving the pg_cancel_backend role that signals background workers including the logical replication launcher autovacuum workers and the autovacuum launcher. Successful exploitation requires a non-core extension with a less-resilient background worker and would affect that specific background worker only. This issue may allow a remote high privileged user to launch a denial of service (DoS) attack.