[security - medium] postgresql:16 security update

PostgreSQL is an advanced object-relational database management system (DBMS).

Security Fix(es):

* postgresql: CREATE STATISTICS does not check for schema CREATE privilege (CVE-2025-12817)
* postgresql: libpq undersizes allocations, via integer wraparound (CVE-2025-12818)

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.

CVE-2025-12817
Missing authorization in PostgreSQL CREATE STATISTICS command allows a table owner to achieve denial of service against other CREATE STATISTICS users by creating in any schema. A later CREATE STATISTICS for the same name, from a user having the CREATE privilege, would then fail. Versions before PostgreSQL 18.1, 17.7, 16.11, 15.15, 14.20, and 13.23 are affected.
CVE-2025-12818
Integer wraparound in multiple PostgreSQL libpq client library functions allows an application input provider or network peer to cause libpq to undersize an allocation and write out-of-bounds by hundreds of megabytes. This results in a segmentation fault for the application using libpq. Versions before PostgreSQL 18.1, 17.7, 16.11, 15.15, 14.20, and 13.23 are affected.

Modularity name: "postgresql"
Stream name: "16"