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
Frequently Asked Questions
What is CVE-2026-6637?
How severe is CVE-2026-6637?
How do I fix CVE-2026-6637?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-66349The MMS server connection handler contains a flaw in its pro…6.9
- CVE-2026-6635A security vulnerability has been detected in rowboatlabs ro…7.3
- CVE-2026-6636A vulnerability was detected in p2r3 convert up to 6998584ac…4.3
- CVE-2026-66360The ISO Presentation layer contains a flaw in the handling o…8.7
- CVE-2026-66364The GOOSE payload parser contains a boundary handling flaw t…7.1
- CVE-2026-66369The GOOSE parser contains an off-by-one boundary-handling fl…7.1
- CVE-2026-66370URL Redirection to Untrusted Site ('Open Redirect') vulnerab…6.1
- CVE-2026-66373Redis before 8.8.0, in the unusual case where an authenticat…7.5
- CVE-2026-66374Knot Resolver before 6.4.1 allows remote code execution via …8.1
- CVE-2026-66375A low-privilege authenticated user may permanently remove pr…8.1
- CVE-2026-66376Credentials for a deleted user may remain valid for a short …4.2
- CVE-2026-66377An unauthenticated user may access restricted repository inf…5.3
Are you affected by CVE-2026-6637?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST