Type Confusion in PostgreSQL - CVE-2026-116306
Published: November 12, 2026
Vulnerability identifier: #VU166130
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-2026-116306
CWE-ID: CWE-843
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code as the operating system user running the database.
The vulnerability exists due to type confusion in PostgreSQL composite-value field assignment when a composite type changes between deforming and reforming a value. A remote user can create an object and change its composite type during this processing to execute arbitrary code as the operating system user running the database.
Affected software
PostgreSQL
How to mitigate CVE-2026-116306
Install security update from vendor's website.
PostgreSQL - addressed in versions 14.25, 15.20, 16.16, 17.12, 18.7