CVE-2026-6637 in PostgreSQL 18.*

Stack buffer overflow in PostgreSQL module "refint" allows an unprivileged database user to execute arbitrary code as the operating system user running the database. A distinct attack is possible if the application declares a user-controlled column as a "refint" cascade primary key and facilitates user-controlled updates to that column. In that case, a SQL injection allows a primary key update value provider to execute arbitrary SQL as the database user performing the primary key update. Vers

Severity

High 8.8

Exploitation

0% chance of exploit
in the next 30 days

Fix

Update to 18.4

Where

Workstation tool

How it matched

Version line match

First seen

2026-11-05 01:13:58 UTC

Source

https://nvd.nist.gov/vuln/detail/CVE-2026-6637