Integer overflow in PostgreSQL - CVE-2026-120139
Published: November 12, 2026
Vulnerability identifier: #VU166101
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-2026-120139
CWE-ID: CWE-190
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 integer wraparound in PostgreSQL core server in-memory tuple-size calculations when processing oversized tuple data. A remote user can supply oversized tuple data to execute arbitrary code with the privileges of the database server process.
Affected software
PostgreSQL
How to mitigate CVE-2026-120139
Install security update from vendor's website.
PostgreSQL - addressed in versions 14.25, 15.20, 16.16, 17.12, 18.7