---
id: CVE-2026-101730
title: >-
  mysql: mysql: Denial of Service via Server Optimizer component
  (CVE-2026-101730)
summary: >-
  A flaw was found in the MySQL Server optimizer component. A remote attacker
  with high privileges can exploit this vulnerability over network protocols to
  cause the database server to hang or repeatedly crash. This issue results in a
  comple…
severity: medium
cvss: 4.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-400
vendor: Red Hat
product: Red Hat Enterprise Linux 10
affected:
  - enterprise_linux 10
  - enterprise_linux 9
published: '2026-10-20'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T22:16:14+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-101730.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-101730.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-101730'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2557518'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-101730'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101730'
  - url: 'https://www.oracle.com/security-alerts/cpuoct2026.html'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00454
epssPercentile: 0.39197
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-22T17:43:37.918709Z'
ingestedAt: '2026-10-20T22:23:33.940Z'
---

## Overview

A flaw was found in the MySQL Server optimizer component. A remote attacker with high privileges can exploit this vulnerability over network protocols to cause the database server to hang or repeatedly crash. This issue results in a complete Denial of Service (DoS) of affected MySQL Server and MySQL Cluster instances.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · updated 2026-10-22 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-101730.json)

**mysql: mysql: Denial of Service via Server Optimizer component** — rated Moderate by Red Hat. Released 2026-10-20, updated 2026-10-22.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 9

No fix planned:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 9

Not affected:

- Red Hat Enterprise Linux 6
- Red Hat Hardened Images

## Remediation

Affected