---
id: CVE-2026-101766
title: 'mysql: mysql: Denial of service in replication component (CVE-2026-101766)'
summary: >-
  A flaw was found in the MySQL replication component. A remote, highly
  privileged attacker could exploit this vulnerability over the network to cause
  MySQL Server or MySQL Cluster to hang or crash repeatedly. This issue leads to
  a complete …
severity: medium
cvss: 4.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/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: '2026-10-22T22:19:23+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-101766.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-101766.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-101766'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2557285'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-101766'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101766'
  - url: 'https://www.oracle.com/security-alerts/cpuoct2026.html'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00346
epssPercentile: 0.28012
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-22T17:26:31.558614Z'
ingestedAt: '2026-10-20T22:23:33.929Z'
---

## Overview

A flaw was found in the MySQL replication component. A remote, highly privileged attacker could exploit this vulnerability over the network to cause MySQL Server or MySQL Cluster to hang or crash repeatedly. This issue leads to a complete denial of service (DoS), making the database service unavailable to authorized users.

## 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-2026-101766.json)

**mysql: mysql: Denial of service in replication 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