---
id: "CVE-2026-101728"
kind: "vulnerability"
aliases: ["CVE-2026-101728"]
title: "MySQL Server: low-privileged network user can crash the server repeatedly"
severity: "medium"
cvss: 6.5
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["database", "mysql", "network-exposed", "package", "self-hosted"]
not_affected_if: ["no-network-clients", "version-outside-range"]
published_at: "2026-10-20T22:18:27+00:00"
first_seen_at: "2026-10-23T21:57:23+00:00"
updated_at: "2026-10-25T03:54:58+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-101728", "first_seen_at": "2026-10-23T21:57:23+00:00"}]
---

# MySQL Server: low-privileged network user can crash the server repeatedly

A low-privileged user with network access can trigger a hang or repeatable crash in MySQL Server and MySQL Cluster through the Pluggable Auth component. The attacker gets denial of service only, with no read or write of data.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Run `SELECT VERSION();` on the server and compare against the affected ranges: 8.4.0 through 8.4.12, 9.7.0 through 9.7.3, 26.7.0 through 26.7.1, and MySQL Cluster 8.0.0 through 8.0.49.

## Fix

- Move MySQL Server 8.4.x to a release after `8.4.12`, 9.7.x to a release after `9.7.3`, and 26.7.x to a release after `26.7.1`.
- Move MySQL Cluster 8.0.x to a release after `8.0.49`.
- Apply the Oracle Critical Patch Update fix for this CVE; the exact fixed build numbers are unknown from the sources.

## Timeline

- 2026-10-23T21:57:23+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-101728

## From the sources

Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Pluggable Auth).  Supported versions that are affected are MySQL Server: 8.4.0-8.4.12, 9.7.0-9.7.3, 26.7.0-26.7.1; MySQL Cluster: 8.0.0-8.0.49, 8.4.0-8.4.12, 9.7.0-9.7.3 and  26.7.0-26.7.1. Easily exploitable vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server, MySQL Cluster.  Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server, MySQL Cluster. CVSS 3.1 Base Score 6.5 (Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

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