Description
Stack buffer overflow in PostgreSQL module "refint" allows an unprivileged database user to execute arbitrary code as the operating system user running the database. A distinct attack is possible if the application declares a user-controlled column as a "refint" cascade primary key and facilitates user-controlled updates to that column. In that case, a SQL injection allows a primary key update value provider to execute arbitrary SQL as the database user performing the primary key update. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.
Problem types
Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
Credits
The PostgreSQL project thanks Nikolay Samokhvalov for reporting this problem.
References
www.postgresql.org/support/security/CVE-2026-6637/