CVE-2026-101607

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Denial of Service in Oracle MySQL Server

Publication date: 2026-10-20

Last updated on: 2026-11-05

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

2026-11-05

Generated

2026-11-10

AI Q&A

2026-10-21

EPSS Evaluated

2026-11-08

NVD

CVE-2026-101607

EUVD

EUVD-2026-106015

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-400	The product does not properly control the allocation and maintenance of a limited resource.

Attack-Flow Graph

Executive Summary

This is a denial-of-service (DoS) vulnerability in Oracle MySQL Server and MySQL Cluster. It affects the Server: Optimizer component and allows a high-privileged attacker with network access to cause the server to hang or crash repeatedly by exploiting flaws in the optimizer.

Detection Guidance

This vulnerability affects specific versions of MySQL Server and MySQL Cluster. To detect it, check your installed MySQL version against the affected ranges: MySQL Server 8.4.0-8.4.12, 9.7.0-9.7.3, 26.7.0-26.7.1 or 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 can disrupt database operations by making the MySQL Server or Cluster unresponsive or repeatedly crashing, leading to downtime and loss of availability for applications relying on these databases.

Compliance Impact

This vulnerability causes denial-of-service (DoS) conditions in MySQL Server and MySQL Cluster, leading to system unavailability. Such disruptions could impact compliance with regulations like GDPR (data processing availability) or HIPAA (system reliability for healthcare data).

Mitigation Strategies

Upgrade MySQL Server and MySQL Cluster to versions 8.4.13, 9.7.4, or 26.7.2 for Server and 8.0.50, 8.4.13, 9.7.4, or 26.7.2 for Cluster to address the vulnerability.

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