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: Security: Encryption). 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. Difficult to exploit 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 5.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/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

2026-10-20

Generated

2026-10-21

AI Q&A

2026-10-21

EPSS Evaluated

N/A

NVD

CVE-2026-101761

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 Oracle MySQL Server and MySQL Cluster. It allows an unauthenticated attacker over a network to crash or hang the database server repeatedly by exploiting weaknesses in the encryption component.

Impact Analysis

If exploited, this vulnerability can cause frequent crashes or hangs in your MySQL Server or Cluster, leading to downtime and loss of availability for your database services.

Mitigation Strategies

Upgrade MySQL Server and MySQL Cluster to versions beyond the affected ranges (8.4.12+, 9.7.3+, 26.7.1+ for Server; 8.0.49+, 8.4.12+, 9.7.3+, 26.7.1+ for Cluster) to resolve the vulnerability.

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