CVE-2026-6470

A flaw was found in PostgreSQL where missing authorization checks in DDL commands allow an authenticated user to create unauthorized dependencies on a data type (such as when assigning a range subtype or referencing the type in an SQL expression). This allows the user to block legitimate owners from altering or dropping that type, resulting in a targeted denial-of-service condition on the affected database object.

This Moderate impact flaw allows an authenticated user with object creation rights to cause a targeted denial of service in PostgreSQL. Missing authorization checks during specific DDL operations allow an attacker to create type dependencies that block legitimate ALTER and DROP commands, preventing routine administrative management of affected data types.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this vulnerability, administrators can proactively monitor for and manually remove unauthorized dependencies created on composite types by users lacking USAGE privileges. Restricting database access and object creation rights only to trusted users will limit the exposure.