Stack-based buffer overflow in PostgreSQL - CVE-2026-6637
Published: May 14, 2026
Vulnerability identifier: #VU131463
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-6637
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: PostgreSQL Global Development Group
Affected software:
PostgreSQL
PostgreSQL
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary code as the operating system user running the database.
The vulnerability exists due to a stack-based buffer overflow in the refint module when processing crafted input. A remote user can supply crafted input to execute arbitrary code as the operating system user running the database.
How to mitigate CVE-2026-6637
Install security update from vendor's website.