Vulnerability Description
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. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Postgresql | Postgresql | < 14.23 |
Related Weaknesses (CWE)
References
- https://www.postgresql.org/support/security/CVE-2026-6637/PatchVendor Advisory
FAQ
What is CVE-2026-6637?
CVE-2026-6637 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 ...
How severe is CVE-2026-6637?
CVE-2026-6637 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-6637?
Check the references section above for vendor advisories and patch information. Affected products include: Postgresql Postgresql.