CVE-2026-101679

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Heap-based Buffer Overflow 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: Client programs). 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 unauthenticated 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 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/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-2026-101679

EUVD

EUVD-2026-106083

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 MySQL Server and MySQL Cluster. It allows an unauthenticated attacker to remotely crash the database by sending specially crafted requests, causing it to hang or repeatedly crash.

Impact Analysis

If exploited, this vulnerability can disrupt database operations, leading to downtime and loss of access to critical data. It does not allow data theft or modification, but it can severely impact availability.

Compliance Impact

This vulnerability may violate compliance requirements that mandate data availability and system reliability, such as GDPR's data protection principles or HIPAA's access controls. Downtime could lead to non-compliance penalties.

Mitigation Strategies

Immediately upgrade MySQL Server and MySQL Cluster to versions beyond the affected ranges (e.g., 8.4.13+, 9.7.4+, 26.7.2+ for Server; 8.0.50+, 8.4.13+, 9.7.4+, 26.7.2+ for Cluster).

Restrict network access to MySQL ports (default 3306) using firewalls or network segmentation.

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