---
id: CVE-2026-101787
title: 'mysql: mysql: Denial of Service via Server Optimizer flaw (CVE-2026-101787)'
summary: >-
  A flaw was found in MySQL within the Server Optimizer component. An
  authenticated remote attacker with high privileges can exploit this
  vulnerability over the network to cause the database to hang or crash
  repeatedly. Successful exploitati…
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-835
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: '2026-10-22T22:20:00+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-101787.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-101787.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-101787'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2557240'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-101787'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101787'
  - url: 'https://www.oracle.com/security-alerts/cpuoct2026.html'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.0039
epssPercentile: 0.32978
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-22T17:02:23.493449Z'
ingestedAt: '2026-10-20T22:23:33.921Z'
---

## Overview

A flaw was found in MySQL within the Server Optimizer component. An authenticated remote attacker with high privileges can exploit this vulnerability over the network to cause the database to hang or crash repeatedly. Successful exploitation results in a complete Denial of Service (DoS) for the affected service.

## 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-2026-101787.json)

**mysql: mysql: Denial of Service via Server Optimizer flaw** — 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