PostgreSQL privilege escalation

With SET ROLE or SET SESSION AUTHORIZATION it's possible to elevate privileges to any database acccount, including superuser or cause database engine crash...

Vulnerability in core server (CVE-2006-0678)

A bug in the handling of SET SESSION AUTHORIZATION can cause a backend crash in Assert enabled builds. This will cause the postmaster to restart all backend, resulting in a denial of service. A valid login is required to exploit this vulnerability...