CVE-2026-101778

Analyzed Analyzed - Analysis Complete

Denial of Service in MySQL Server

Publication date: 2026-10-20

Last updated on: 2026-10-30

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 low 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 6.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

CVSS Scores

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Meta Information

Published

2026-10-20

Last Modified

2026-10-30

Generated

2026-11-10

AI Q&A

2026-10-21

EPSS Evaluated

2026-11-09

NVD

CVE-2026-101778

EUVD

EUVD-2026-106179

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	mysql_cluster	From 26.7.0 (inc) to 26.7.1 (inc)
oracle	mysql_cluster	From 8.0.0 (inc) to 8.0.49 (inc)
oracle	mysql_cluster	From 8.4.0 (inc) to 8.4.12 (inc)
oracle	mysql_cluster	From 9.7.0 (inc) to 9.7.3 (inc)
oracle	mysql_server	From 26.7.0 (inc) to 26.7.1 (inc)
oracle	mysql_server	From 8.4.0 (inc) to 8.4.12 (inc)
oracle	mysql_server	From 9.7.0 (inc) to 9.7.3 (inc)

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 low-privileged attacker with network access to crash the server or cause repeated crashes, making it unavailable.

Detection Guidance

Detecting this vulnerability requires checking the installed MySQL Server or MySQL Cluster version against the affected versions listed (8.4.0-8.4.12, 9.7.0-9.7.3, 26.7.0-26.7.1 for MySQL Server and 8.0.0-8.0.49, 8.4.0-8.4.12, 9.7.0-9.7.3, 26.7.0-26.7.1 for MySQL Cluster). Use commands like 'mysql --version' or 'mysqld --version' to check the version.

Impact Analysis

If exploited, it could disrupt database services, leading to downtime for applications relying on MySQL. This affects availability and may cause data access issues or service interruptions.

Compliance Impact

Downtime or data unavailability due to this vulnerability could violate compliance requirements for GDPR (data availability) or HIPAA (system reliability). Organizations may face penalties if service disruptions impact regulated data access.

Mitigation Strategies

Immediately upgrade MySQL Server or MySQL Cluster to a version not listed as affected. Apply the latest patches from Oracle to address this vulnerability and prevent potential denial-of-service attacks.

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