Summary
PostgreSQL patched a vulnerability (CVE-2026-6471) that allows attackers with low-privilege replication access to execute arbitrary code and gain full superuser control. The flaw, present since 2014, enables persistent backdoor access across Windows, Linux, and macOS environments.
Take Action:
If you run PostgreSQL, update immediately to version 18.6, 17.11, 16.15, 15.19, or 14.24 to fix CVE-2026-6471. Then review who has the REPLICATION permission and remove it from anyone who doesn't need it, restrict replication access in pg_hba.conf to trusted IP addresses only, and block outbound SMB and NFS traffic from your database servers.
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This article was originally published on BeyondMachines
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