CVE-2023-39418: Debian Linux

Medium severity, CVSS 4.3. EPSS: 1.1% chance of exploitation in the next 30 days.

A vulnerability was found in PostgreSQL with the use of the MERGE command, which fails to test new rows against row security policies defined for UPDATE and SELECT. If UPDATE and SELECT policies forbid some rows that INSERT policies do not forbid, a user could store such rows.

Affected products

• Debian Debian Linux: version 12.0 only
• PostgreSQL PostgreSQL: from 15.0, before 15.4 (fixed in 15.4)
• Red Hat Enterprise Linux: version 8.0 only; version 9.0 only

Published 2023-08-11. Last modified 2026-06-17.