Denial of Service in Oracle MySQL Server

Publication date: 2026-10-20

Last updated on: 2026-10-20

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

2026-10-20

Generated

2026-10-21

AI Q&A

2026-10-21

EPSS Evaluated

N/A

NVD

CVE-2026-101801

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-UNKNOWN

Attack-Flow Graph

Executive Summary

This is a denial-of-service (DoS) vulnerability in the MySQL Server and MySQL Cluster products. It exists in the Server: Optimizer component and allows a high-privileged attacker with network access to cause the server to hang or crash repeatedly, making it unavailable.

Impact Analysis

If exploited, this vulnerability can disrupt database operations by causing MySQL Server or MySQL Cluster to become unresponsive or crash frequently. This leads to downtime, data unavailability, and potential service disruptions for applications relying on these databases.

Mitigation Strategies

Upgrade MySQL Server and MySQL Cluster to versions 8.4.13, 9.7.4, or 26.7.2 (or later) as these address the vulnerability. Apply the latest Oracle Critical Patch Update if available.

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