What is CVE-2026-6637?

CVE-2026-6637 is a high-severity vulnerability in Postgresql, classified under SQL Injection. CVSS score: 8.8/10. Published 2026-05-14.

How severe is CVE-2026-6637?

High severity. CVSS v3 base score is 8.8 out of 10.

SQL Injection in Postgresql

CVE-2026-6637

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-control…

Vulnerability class: SQL Injection

EPSS: 0.000 (12.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Postgresql
N/a Postgresql — versions 18, 17, 16

Weakness classification (CWE)

CWE-89 — SQL Injection
CWE-121 — Stack-based Buffer Overflow

References

f86ef6dc-4d3a-42ad-8f28-e6d5547a5007 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-6637?: CVE-2026-6637 is a high-severity vulnerability in Postgresql, classified under SQL Injection. CVSS score: 8.8/10. Published 2026-05-14.
How severe is CVE-2026-6637?: High severity. CVSS v3 base score is 8.8 out of 10.