CVE-2026-101623

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Denial of Service in Oracle MySQL Server

Publication date: 2026-10-20

Last updated on: 2026-10-21

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: 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 high 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 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).

CVSS Scores

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Meta Information

Published

2026-10-20

Last Modified

2026-10-21

Generated

2026-11-10

AI Q&A

2026-10-21

EPSS Evaluated

2026-11-08

NVD

CVE-2026-101623

EUVD

EUVD-2026-106031

Affected Vendors & Products

Vendor	Product	Version / Range
Oracle Corporation	MySQL Server	8.4.0-8.4.12
Oracle Corporation	MySQL Server	9.7.0-9.7.3
Oracle Corporation	MySQL Server	26.7.0-26.7.1
Oracle Corporation	MySQL Cluster	8.0.0-8.0.49
Oracle Corporation	MySQL Cluster	8.4.0-8.4.12
Oracle Corporation	MySQL Cluster	9.7.0-9.7.3
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 denial-of-service (DoS) vulnerability in the MySQL Server and MySQL Cluster products. It affects specific versions of the Optimizer component in MySQL Server and MySQL Cluster. An attacker with high privileges and network access can exploit it to cause the server or cluster to hang or crash repeatedly, leading to a complete denial of service.

Detection Guidance

Detecting this vulnerability requires checking the installed MySQL Server or MySQL Cluster version. Use commands like 'mysql --version' or 'mysqld --version' to verify the version. Compare the output against the affected versions listed in the CVE description.

Impact Analysis

If you use an affected version of MySQL Server or MySQL Cluster, an attacker could disrupt database operations by causing crashes or hangs. This could lead to downtime, data unavailability, and potential loss of service for applications relying on the database.

Compliance Impact

This vulnerability could impact compliance by causing data unavailability or service disruptions, which may violate availability requirements in GDPR and HIPAA. Downtime could lead to unauthorized access risks or failure to meet data retention and accessibility standards.

Mitigation Strategies

Immediately upgrade MySQL Server or MySQL Cluster to a version not listed as affected. For MySQL Server, upgrade to versions 8.4.13 or later, 9.7.4 or later, or 26.7.2 or later. For MySQL Cluster, upgrade to 8.0.50 or later, 8.4.13 or later, 9.7.4 or later, or 26.7.2 or later.

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