CVE-2026-6637Disclosure(postgresql / postgresql)

LOWCVSS 8.8 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch postgresql postgresql systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD 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.

postgresql CVEs Back to dashboard

0.5/ 10 priority

Sources & remediation

Patch / fix

https://www.postgresql.org/support/security/CVE-2026-6637/

Weakness type (CWE)

CWE-89CWE-121

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

postgresql

Threat summary

Patch or workaround signal is available
4 mentions across 3 observed days
Momentum state: stable

What's happening

Patch or workaround mentioned in 2 signals
Technical details provided in 3 signals
Disclosure: 2 classified signals
General: 1 classified signal
Peaked 2d ago at 2 mentions (2026-05-14); latest day: 1
4 total mentions across 3 days

Affected systems

Vendors

postgresql

Products

postgresql

Deep dive

Activity timeline4 mentions / 3d

Signal classification3 categories

Disclosure

250.0%

Patch

125.0%

General

125.0%

Referenced assets5 URLs

By indicator

Classification over time

Date	Total	Labels

2026-05-14	2	Disclosure2
2026-05-21	1	Patch1
2026-05-26	1	General1

Full discourse4 posts

Nik Samokhvalov@samokhvalov134d
General
my first CVE https://www.postgresql.org/support/security/CVE-2026-6637/ https://www.cve.org/CVERecord?id=CVE-2026-6637 mixed feelings – CVE counts are spiking everywhere, are we're at the beginning of tsunami for FOSS? upgrade sooner
Post summary
The post points to CVE-2026-6637 by linking to the official pages and comments on the growing number of CVEs, but it does not provide technical details, exploitation information, or mitigation steps.
1301921.9K
12.4K followersView on X
Upwind Security MDR@UpwindMDR147d
Disclosure
New PostgreSQL vulnerabilities were disclosed today, including issues related to code execution, SQL injection, and denial of service. Worth reviewing: • CVE-2026-6637 – potential code execution via refint • CVE-2026-6476 – SQL injection in pg_createsubscriber • CVE-2026-6479 – DoS in SSL/GSS negotiation PostgreSQL teams may want to review affected versions and patch guidance. https://www.postgresql.org/about/news/postgresql-184-1710-1614-1518-and-1423-released-3297/
Post summary
Three new PostgreSQL CVEs have been disclosed, detailing code execution, SQL injection, and DoS vulnerabilities, with recommended patch guidance for affected versions.
00131598
255 followersView on X
セキュリティ対策Lab@securityLab_jp140d
Patch
PostgreSQLが11件の脆弱性を修正、CVE-2026-6637など危険度度が高い脆弱性に注意-PostgreSQL 14は2026年11月にEOLへ https://rocket-boys.co.jp/security-measures-lab/postgresql-11-vulnerabilities-fixed-cve-2026-6637/ #セキュリティ対策Lab #security #securitynews
Post summary
PostgreSQL has released patches for 11 vulnerabilities, including the high‑severity CVE‑2026‑6637, and encourages users to update before the upcoming EOL of PostgreSQL 14.
00000148
407 followersView on X
Kaitan ID Security@KaitanSecurity147d
Disclosure
⚠️ HIGH — CVE-2026-6637 Stack buffer overflow in PostgreSQL module "refint" allows an unprivileged database user to execute arbitrary code as t… CVSS 8.8 Full analysis → https://sec.kaitan.id/cves/CVE-2026-6637 #PostgreSQL #CyberSecurity #InfoSec
Post summary
A stack buffer overflow vulnerability (CVE‑2026‑6637) in PostgreSQL's "refint" module has been disclosed, allowing unprivileged database users to execute arbitrary code, with no current evidence of exploitation or available patch.
0000036
90 followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	postgresql	postgresql	-	-	-

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What researchers are saying

CVE-2026-6637

Nik Samokhvalov[verified]@samokhvalovGeneral

The post points to CVE-2026-6637 by linking to the official pages and comments on the growing number of CVEs, but it does not provide technical details, exploitation information, or mitigation steps.

Upwind Security MDR[verified]@UpwindMDRDisclosure

Three new PostgreSQL CVEs have been disclosed, detailing code execution, SQL injection, and DoS vulnerabilities, with recommended patch guidance for affected versions.

セキュリティ対策Lab[verified]@securityLab_jpPatch

PostgreSQL has released patches for 11 vulnerabilities, including the high‑severity CVE‑2026‑6637, and encourages users to update before the upcoming EOL of PostgreSQL 14.

Kaitan ID Security[verified]@KaitanSecurityDisclosure

A stack buffer overflow vulnerability (CVE‑2026‑6637) in PostgreSQL's "refint" module has been disclosed, allowing unprivileged database users to execute arbitrary code, with no current evidence of exploitation or available patch.