PostgreSQL Integer Overflow or Wraparound Vulnerability - CVE-2026-6473

Integer wraparound in multiple PostgreSQL server features allows an unprivileged database user to cause the server to undersize an allocation and write out-of-bounds. This may execute arbitrary code as the operating system user running the database. In applications that pass gigabyte-scale user inputs to the relevant database functions the application input provider may achieve a segmentation fault. Versions before PostgreSQL 18.4 17.10 16.14 15.18 and 14.23 are affected.