CVE-2026-6637
Last modified
CVE-2026-6637 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 0.38% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Postgresql | Postgresql | < 14.23 |
| Postgresql | Postgresql | >= 15.0, < 15.18 |
| Postgresql | Postgresql | >= 16.0, < 16.14 |
| Postgresql | Postgresql | >= 17.0, < 17.10 |
| Postgresql | Postgresql | >= 18.0, < 18.4 |
References
- https://www.postgresql.org/support/security/CVE-2026-6637/Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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