---
id: "CVE-2026-101726"
kind: "vulnerability"
aliases: ["CVE-2026-101726"]
title: "MySQL Server and Cluster: low-privilege network user can crash the server"
severity: "medium"
cvss: 6.5
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["databases", "mysql", "mysql-cluster", "package", "self-hosted"]
not_affected_if: ["no-network-access", "unaffected-version"]
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-2026-101726", "first_seen_at": "2026-10-23T21:57:23+00:00"}]
---

# MySQL Server and Cluster: low-privilege network user can crash the server

A flaw in the MySQL C API component of MySQL Server and MySQL Cluster lets a low-privilege user reach the server over the network and cause a hang or repeatable crash. The impact is denial of service only; no data exposure or code execution is stated.

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

## How to check

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

## Fix

- Upgrade MySQL Server and MySQL Cluster to a release outside the affected ranges; the sources do not name the exact fixed version.

## Timeline

- 2026-10-23T21:57:23+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-101726

## From the sources

Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: C API).  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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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_