CVE-2026-6473: PostgreSQL

High severity, CVSS 8.8. EPSS: 1% chance of exploitation in the next 30 days.

Integer wraparound in multiple PostgreSQL server features allows an unprivileged database user to cause the server to undersize an allocation and write out-of-bounds. This may execute arbitrary code as the operating system user running the database. In applications that pass gigabyte-scale user inputs to the relevant database functions, the application input provider may achieve a segmentation fault. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.

Affected products

• PostgreSQL PostgreSQL: before 14.23 (fixed in 14.23); from 15.0, before 15.18 (fixed in 15.18); from 16.0, before 16.14 (fixed in 16.14); from 17.0, before 17.10 (fixed in 17.10); from 18.0, before 18.4 (fixed in 18.4)

Published 2026-05-14. Last modified 2026-08-25.