PostgreSQL logical decoding fix: update and review output plugins
CVE-2026-6471 concerns replication privileges and logical decoding. Plan both the security update and compatibility checks for replication plugins.
What PostgreSQL fixed
PostgreSQL’s advisory describes CVE-2026-6471 as arbitrary library loading through logical decoding. Exploitation requires replication privileges. The fixed versions are 18.6, 17.11, 16.15, 15.19 and 14.24; consult distribution advisories for equivalent packaged fixes.
A configuration change accompanies the patch
The PostgreSQL 18.6 release notes introduce output_plugin_libraries to restrict allowed logical decoding libraries. Its default includes pgoutput and test_decoding. Administrators using other output plugins must review the allowlist so that legitimate replication remains available after updating.
AZTCOFW perspective
Database maintenance includes dependencies beyond the application connection. A change-data-capture pipeline or backup integration can fail while normal queries continue to work. Assign owners to those dependencies and include them in the maintenance checklist.
Record the plugins and replication roles actually required, prepare a recovery plan, and verify downstream data flow after the update. Review privileges that remain assigned to retired integrations. Network restrictions should support this work, while the vendor patch addresses the underlying software defect.
The report below discusses the issue’s history, dating logical decoding to PostgreSQL 9.4. Use the upstream security advisory and release notes for precise remediation decisions.
