PostgreSQL is an advanced object-relational database management system. The postgresql-jdbc package includes the .jar files needed for Java programs to access a PostgreSQL database.
This update introduces a backwards incompatible change required to resolve this issue. Refer to the Red Hat Knowledgebase article 5266441 linked to in the References section for information on how to re-enable the old insecure behavior.
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.