Buffer over-read in PostgreSQL GB18030 encoding validation allows a database input provider to achieve temporary denial of service on platforms where a 1-byte over-read can elicit process termination. This affects the database server and also libpq. Versions before PostgreSQL 17.5, 16.9, 15.13, 14.18, and 13.21 are affected.
https://www.postgresql.org/support/security/CVE-2025-4207/
https://lists.debian.org/debian-lts-announce/2025/05/msg00011.html