Announcing the PostgreSQL STIG
info.crunchydata.com
info.crunchydata.com
Also, there's more information here: https://www.enterprisedb.com/news/us-government-publishes-ed...
This STIG is actually for open source PostgreSQL. The EnterpriseDB link posted relates to a STIG for EDB's PostgreSQL Plus Advanced Server product and requires EDB's proprietary version of PostgreSQL.