CVE-2026-6470 PostgreSQL CVE debrief

Who should care

PostgreSQL users and administrators, especially those with unprivileged object creators in their databases, should be aware of this vulnerability and take necessary actions to protect their installations. This includes assessing the version of PostgreSQL being used, identifying potential exposure, and applying vendor patches or upgrades to affected versions. Additionally, monitoring for unusual DDL operations and dependency creation, and restricting privileges for object creators where possible, can help mitigate the vulnerability.

Technical summary

The vulnerability is caused by missing authorization in PostgreSQL DDL commands, allowing an object creator to achieve denial of service against ALTER and DROP operations on types by creating a dependency on the type. Many DDL operations did check the privilege, but assigning a range subtype and referencing the type from an SQL expression did not. Affected versions include PostgreSQL before 18.6, 17.11, 16.15, 15.19, and 14.24. The vulnerability allows for denial of service against ALTER and DROP operations.

Defensive priority

Medium priority for PostgreSQL users, as the vulnerability allows for denial of service against ALTER and DROP operations.

Recommended defensive actions

• Inventory and assess PostgreSQL installations for version checks and potential exposure.
• Apply vendor patches or upgrades to affected versions.
• Monitor for unusual DDL operations and dependency creation.
• Restrict privileges for object creators where possible.
• Implement compensating controls for DDL operations.

Evidence notes

The vulnerability is caused by missing authorization in PostgreSQL DDL commands, allowing an object creator to achieve denial of service. Affected versions include PostgreSQL before 18.6, 17.11, 16.15, 15.19, and 14.24. The vulnerability allows for denial of service against ALTER and DROP operations on types by creating a dependency on the type. Many DDL operations did check the privilege, but assigning a range subtype and referencing the type from an SQL expression did not. Defenders should verify the version of PostgreSQL being used and assess the potential exposure of their installations.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.