Heap-based buffer overflow in PostgreSQL - CVE-2026-120149
Published: November 12, 2026
Vulnerability identifier: #VU166092
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-120149
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code on the PostgreSQL server.
The vulnerability exists due to a heap-based buffer overflow in PostgreSQL foreign batch insert handling when processing a foreign server's reported inserted-row count. A remote user can cause a foreign server to report that it inserted more rows than the PostgreSQL server supplied to execute arbitrary code.
Affected software
PostgreSQL
How to mitigate CVE-2026-120149
Install security update from vendor's website.
PostgreSQL - addressed in versions 14.25, 15.20, 16.16, 17.12, 18.7