CVE-2026-101721

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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: Components Services). 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

2026-10-22

Generated

2026-11-10

AI Q&A

2026-10-21

EPSS Evaluated

2026-11-08

NVD

CVE-2026-101721

EUVD

EUVD-2026-106122

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 Oracle MySQL Server and MySQL Cluster. It allows a high-privileged attacker with network access to cause the server or cluster to hang or crash repeatedly by exploiting flaws in the Server: Components Services component.

Detection Guidance

This vulnerability affects specific versions of MySQL Server and MySQL Cluster. To detect it, check your installed MySQL versions against the affected ranges: 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, 26.7.0-26.7.1. Use commands like 'mysql --version' or check package managers (e.g., 'dpkg -l | grep mysql-server' on Debian/Ubuntu).

Impact Analysis

If exploited, this vulnerability could disrupt database services by making them unavailable, leading to downtime for applications relying on MySQL. This impacts operations that depend on MySQL for data storage and processing.

Compliance Impact

This vulnerability causes denial-of-service (DoS) conditions in MySQL Server and MySQL Cluster, leading to system unavailability. Unavailability of critical systems may violate compliance requirements for data availability under regulations like GDPR (Article 32) and HIPAA (Security Rule).

Mitigation Strategies

Apply the latest security patches from Oracle for affected MySQL Server and MySQL Cluster versions immediately. Check Oracle's advisory for version-specific fixes and update to versions 8.4.13, 9.7.4, 26.7.2 or later for MySQL Server and 8.0.50, 8.4.13, 9.7.4, 26.7.2 or later for MySQL Cluster.

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