High [CVE-2026-6471] Arbitrary code execution via logical decoding plugin
This high-severity Red Hat Linux advisory covers CVE-2026-6471 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
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Summary
Missing authorization in PostgreSQL logical decoding allows a non-superuser holding REPLICATION privilege to dlopen any file visible to the operating system account running the server, via the choice of logical decoding plugin. This in turn runs arbitrary code as that account.
Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected. A flaw was found in PostgreSQL.
Exploitation requires an attacker to already have significant access to the database, specifically the REPLICATION role, which is not granted by default to typical users, thus reducing the overall risk. Red Hat severity: Important — CVSS 7.2 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H).
Weakness: CWE-94. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Self-service automation portal 2.
Red Hat lists Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Hardened Images as not affected. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: postgresql16; Red Hat package: postgresql18.
- < 18.5
- < 17.11
- < 16.15
- < 15.19
- < 14.24
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- To mitigate this vulnerability, ensure that the REPLICATION privilege is granted only to highly trusted database superusers. Regularly review user privileges to confirm that non-superuser accounts do not possess the REPLICATION privilege unless absolutely necessary and their activities are closely monitored. If logical decoding is not actively used, consider disabling it to further reduce the attack surface, though specific configuration steps for disabling logical decoding are beyond the scope of this mitigation.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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