CVE-2026-101786

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Denial of Service in MySQL Server

Publication date: 2026-10-20

Last updated on: 2026-10-22

Assigner: Oracle

Description

Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are MySQL Server: 26.7.0-26.7.1; MySQL Cluster: 26.7.0-26.7.1. Easily exploitable vulnerability allows high privileged attacker with network access via multiple protocols to compromise MySQL Server, MySQL Cluster. Successful attacks of this vulnerability can result in takeover of MySQL Server, MySQL Cluster. CVSS 3.1 Base Score 7.2 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H).

CVSS Scores

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Meta Information

Published

2026-10-20

Last Modified

2026-10-22

Generated

2026-11-10

AI Q&A

2026-10-21

EPSS Evaluated

2026-11-08

NVD

CVE-2026-101786

EUVD

EUVD-2026-106187

Affected Vendors & Products

Vendor	Product	Version / Range
Oracle Corporation	MySQL Server	26.7.0-26.7.1
Oracle Corporation	MySQL Cluster	26.7.0-26.7.1

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-284	The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Attack-Flow Graph

Executive Summary

This is a vulnerability in the MySQL Server and MySQL Cluster products affecting versions 26.7.0 to 26.7.1. It allows a high-privileged attacker with network access to take over the server or cluster by exploiting the Server: Optimizer component.

Detection Guidance

This vulnerability affects MySQL Server versions 26.7.0 to 26.7.1 and MySQL Cluster versions 26.7.0 to 26.7.1. To detect it, check your MySQL version using commands like 'mysql --version' or 'SELECT VERSION();' in the MySQL shell. If your version falls within the affected range, the system is vulnerable.

Impact Analysis

An attacker could gain full control over the MySQL Server or MySQL Cluster, leading to unauthorized access, data theft, modification, or deletion. This could disrupt database operations and compromise sensitive information.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating GDPR and HIPAA requirements for data protection and confidentiality. Organizations may face legal penalties and reputational damage.

Mitigation Strategies

Upgrade MySQL Server and MySQL Cluster to versions later than 26.7.1 to address the vulnerability in the Server: Optimizer component.

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