The vulnerability CVE-2026-6471 affects PostgreSQL installations on Windows, Linux, and macOS, impacting versions since 9.4 released in 2014. All supported releases have been patched, including versions 18.6, 17.11, 16.15, 15.19, and 14.24, updated on August 13. The vulnerability arises from PostgreSQL's management of output plugins for logical replication, which are dynamically loaded compiled code, leading to insufficient existing security measures.