CVE-2026-101781

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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: Group Replication GCS). 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 access to the physical communication segment attached to the hardware where the MySQL Server, MySQL Cluster executes to compromise MySQL Server, MySQL Cluster. Successful attacks of this vulnerability can result in takeover of MySQL Server, MySQL Cluster. CVSS 3.1 Base Score 8.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/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

2026-11-08

NVD

CVE-2026-101781

EUVD

EUVD-2026-106182

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 vulnerability affects the MySQL Server and MySQL Cluster products, specifically in the Group Replication GCS component. It allows an unauthenticated attacker with access to the physical communication segment to compromise the server or cluster. Successful exploitation can lead to a full takeover of the affected systems.

Detection Guidance

This vulnerability requires physical access to the network segment where MySQL Server or MySQL Cluster operates. Detection primarily involves monitoring network traffic for unauthorized Group Replication GCS protocol interactions. Check MySQL logs for unusual Group Replication activity or failed authentication attempts. Ensure network segmentation is enforced to prevent unauthorized access to the physical communication segment.

Impact Analysis

If you use MySQL Server versions 8.4.0-8.4.12, 9.7.0-9.7.3, or 26.7.0-26.7.1, or MySQL Cluster versions 8.0.0-8.0.49, 8.4.0-8.4.12, 9.7.0-9.7.3, or 26.7.0-26.7.1, an attacker could gain control of your database systems. This could result in unauthorized access, data theft, or disruption of services.

Compliance Impact

This vulnerability allows unauthenticated attackers with physical network access to compromise MySQL Server or Cluster, potentially leading to unauthorized data access, modification, or deletion. This could violate GDPR's data integrity and confidentiality requirements or HIPAA's safeguards for protected health information if exploited.

Mitigation Strategies

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

Restrict physical access to the network segment where MySQL Server or Cluster executes to prevent unauthorized access.

Monitor network traffic for unusual activity targeting MySQL Group Replication GCS components.

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