CVE-2026-6637
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2026-6637
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2026-6637.html
Vendor advisory: f86ef6dc-4d3a-42ad-8f28-e6d5547a5007 — https://www.postgresql.org/support/security/CVE-2026-6637/
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bullseye | affected | |
| debian | bookworm | fixed | 15.18-0+deb12u1 |
| debian | forky | fixed | 18.4-1 |
| debian | sid | fixed | 18.4-1 |
| debian | trixie | fixed | 17.10-0+deb13u1 |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| postgresql | postgresql | {"endExcluding":"14.23"} | 14.23 |
References
CWEs
CWE-89 CWE-121
Verify integrity in audit chain (admin only). AS-IS.