
PostgreSQL's 12-Year Security Blind Spot: CVE-2026-6471 Exposes Critical Database Infrastructure Risks
PostgreSQL disclosed CVE-2026-6471, a critical 12-year-old vulnerability in logical decoding that allows accounts with REPLICATION privileges to execute arbitrary code as the database server's operating system user. The flaw, present since PostgreSQL 9.4 in 2014, enables attackers to bypass existing security restrictions by loading malicious libraries through the CREATE_REPLICATION_SLOT command. Exploitation requires a replication account and wal_level=logical configuration, commonly found in backup tools, standby servers, and CDC pipelines. The vulnerability affects versions before 18.6, 17.11, 16.15, 15.19, and 14.24, with fixes introducing the output_plugin_libraries parameter to whitelist approved plugins. This incident highlights the growing threat to database infrastructure as organizations increasingly rely on distributed data architectures and replication mechanisms. With PostgreSQL powering critical applications across industries, this vulnerability exposes the risks of privilege escalation through seemingly low-privilege backup credentials, emphasizing the need for comprehensive database security controls and regular privilege audits.
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