CVE-2026-6637

About vulnerability

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.

Affected product:

AlmaLinux 9.2 ESU , Alpine Linux 3.22 , Alpine Linux 3.23 , Amazon Linux 2 ELS , CentOS 7 ELS , Debian 10 ELS , Debian 12 , Debian 13 , Oracle Linux 7 ELS , RHEL 7 ELS , RHEL 8 ELS , TuxCare 9.6 ESU , Ubuntu 16.04 ELS , Ubuntu 18.04 ELS , Ubuntu 20.04 ELS

Affected packages:

postgresql @ 11_11.22 (+25 more)

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.