CVE-2026-6638

Description

SQL injection in PostgreSQL logical replication ALTER SUBSCRIPTION ... REFRESH PUBLICATION allows a subscriber table creator to execute arbitrary SQL with the subscription's publication-side credentials. The attack takes effect at the next REFRESH PUBLICATION. Within major versions 16, 17, and 18, minor versions before PostgreSQL 18.4, 17.10, and 16.14 are affected. Versions before PostgreSQL 16 are unaffected.

Overview

State: PUBLISHED
Assigner (CNA): PostgreSQL
CVSS severity: LOW
CVSS score: 3.7 / 10
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N
Effective score: 3.7 / 10 LOW source: CNA overview
MSRC score: 3.7 / 10 LOW MS rating: Low
CWE(s): CWE-89
Reserved: 2026-04-19
Published: 2026-05-14 15:00 UTC
Last updated: 2026-05-14 17:28 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/6xxx/CVE-2026-6638.json
Linked Threat: CVE-2026-6638 — CVE-2026-6638

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-05-14 14:16:25 UTC
NVD last modified: 2026-05-18 14:14:33 UTC
NVD CVSS v3.1: 3.7 / 10 LOW source: f86ef6dc-4d3a-42ad-8f28-e6d5547a5007
NVD CVSS vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N
Exploitability subscore: 1.2 / 10
Impact subscore: 2.5 / 10
EPSS score: 0.0002 (probability of exploitation in next 30 days)
EPSS percentile: 7.21% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-30290
Assigner: PostgreSQL
Published: May 14, 2026, 1:00:15 PM
Updated: May 14, 2026, 3:28:30 PM
EUVD base score (CVSS 3.1): 3.7 / 10
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N
EUVD-reported EPSS: 0.0200
Vendors: n/a
Products: PostgreSQL (18 <18.4)

PostgreSQL (16 <16.14)

PostgreSQL (17 <17.10)
Aliases: GHSA-3835-x2rj-c3qj

ENISA description: SQL injection in PostgreSQL logical replication ALTER SUBSCRIPTION ... REFRESH PUBLICATION allows a subscriber table creator to execute arbitrary SQL with the subscription's publication-side credentials. The attack takes effect at the next REFRESH PUBLICATION. Within major versions 16, 17, and 18, minor versions before PostgreSQL 18.4, 17.10, and 16.14 are affected. Versions before PostgreSQL 16 are unaffected.

EUVD references (1)

https://www.postgresql.org/support/security/CVE-2026-6638/

Microsoft Security Response Center MSRC

Microsoft's vendor-authoritative record from the Security Update Guide — its own CVSS score, impact, severity rating, exploit assessment, and KB-article fixes. Refreshed 2026-07-28 03:00 UTC (source: CVRF).

MS severity: Low
MS CVSS base score: 3.7 / 10 (temporal 3.7)
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N
Release: 2026-May

Microsoft remediations / KB articles (2)

CBL-Mariner Releases — Vendor Fix / Security Update (fixed build 16.14-1)
https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade — None Available / CBL-Mariner Releases

Affected products (1)

Vendor	Product	Versions	Platforms
n/a	PostgreSQL	`18` (affected), `17` (affected), `16` (affected)	—

Affected products — CPE 2.3 (1) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:*

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

https://www.postgresql.org/support/security/CVE-2026-6638/

MITRE references (1) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

https://www.postgresql.org/support/security/CVE-2026-6638/

Web references (9)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

None Available msrc
MSRC update guide: CVE-2026-6638 msrc
https://security.alpinelinux.org/vuln/CVE-2026-6638 rapid7:security.alpinelinux.org
https://attackerkb.com/topics/CVE-2026-6638 rapid7:attackerkb.com
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30290 rapid7:euvd.enisa.europa.eu
http://cwe.mitre.org/data/definitions/89.html rapid7:cwe.mitre.org
https://nvd.nist.gov/vuln/detail/CVE-2026-6638 tenable:nvd.nist.gov
https://www.cve.org/CVERecord?id=CVE-2026-6638 tenable:www.cve.org
https://www.first.org/epss/ tenable:www.first.org

NVD-tagged references (1)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://www.postgresql.org/support/security/CVE-2026-6638/ f86ef6dc-4d3a-42ad-8f28-e6d5547a5007 PatchVendor Advisory

Remediations (13)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

CVE-2026-6638 - Vulnerability Details - OpenCVE

web:app.opencve.io

Remediation No vendor fix or workaround currently provided. OpenCVE Recommended Actions Upgrade PostgreSQL to a patched release (≥ 18.4, ≥ 17.10, or ≥ 16.14) to eliminate the vulnerability. Revoke CREATE privileges on subscription tables from untrusted or non‑admin users to prevent injection attempts.

2026-05-23 20:53 UTC
SQL injection in PostgreSQL logical replication ALTER...

web:github.com

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Without sufficient removal or quoting ...

2026-05-23 20:53 UTC
CVE-2026-6638 | Security Details | Sonatype Guide

web:guide.sonatype.com

Technical security analysis for CVE-2026-6638 . CVSS 8.8 severity. View CVSS vectors, CWE classifications, and exploit maturity ratings.

2026-05-23 20:53 UTC
Nvd - Cve-2026-6638

web:nvd.nist.gov

Official websites use .gov A .gov website belongs to an official government organization in the United States.

2026-05-23 20:53 UTC
Security Update Guide - Microsoft

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-05-23 20:53 UTC
CVE-2026-6638 | Ubuntu

web:ubuntu.com

Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things.

2026-05-23 20:53 UTC
CVE-2026-6638: PostgreSQL SQL Injection via REFRESH PUBLICATION

web:vulert.com

Learn about CVE-2026-6638 , a PostgreSQL vulnerability allowing SQL injection via REFRESH PUBLICATION. Discover how to fix it and stay secure.

2026-05-23 20:53 UTC
CVE-2026-6638 - PostgreSQL

web:www.postgresql.org

CVE-2026-6638 PostgreSQL REFRESH PUBLICATION allows SQL injection via table name SQL injection in PostgreSQL logical replication ALTER SUBSCRIPTION ... REFRESH PUBLICATION allows a subscriber table creator to execute arbitrary SQL with the subscription's publication-side credentials. The attack takes effect at the next REFRESH PUBLICATION. Within major versions 16, 17, and 18, minor versions ...

2026-05-23 20:53 UTC
CVE-2026-6638 Common Vulnerabilities and Exposures | SUSE

web:www.suse.com

Secure your Linux systems from CVE-2026-6638 . Stay ahead of potential threats with the latest security updates from SUSE.

2026-05-23 20:53 UTC
CVE-2026-6638 - Low Vulnerability - TheHackerWire

web:www.thehackerwire.com

How severe is CVE-2026-6638 ? What Postgresql products are affected by CVE-2026-6638 ? How do I fix or mitigate CVE-2026-6638 ? When was CVE-2026-6638 disclosed?

2026-05-23 20:53 UTC
CISA Warns of Exploited Microsoft Defender 0-Day Flaws

web:cyberpress.org

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added two actively exploited Microsoft Defender vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog, issuing an urgent remediation directive for federal agencies with a due date of June 3, 2026 .

2026-05-26 02:55 UTC
Security Advisories and Bulletins | Microsoft Learn

web:learn.microsoft.com

Learning path Learn how Microsoft supports secure software development as part of a cybersecurity solution - Training Secure software development means integrating security into each phase of your development lifecycle, from requirements analysis to maintenance. Microsoft provides many services that can help you develop more secure code and deploy a more secure application in the cloud. This ...

2026-05-26 02:55 UTC
Oracle Critical Patch Update Advisory - April 2026

web:www.oracle.com

This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

2026-05-26 02:55 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-6638.json.

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