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).
Published: 2026-10-20
Score: 4.9 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Denial of Service
Action: Immediate Upgrade
AI Analysis

Impact

A flaw exists in the MySQL Server and MySQL Cluster optimizer that stems from improper access control (CWE‑284) and uncontrolled resource consumption (CWE‑400). A high‑privileged attacker with network access can trigger a hang or frequent crash of the database service, causing a denial of service. The vulnerability is rated with a CVSS 3.1 base score of 4.9, indicating an availability impact with no impact on confidentiality or integrity.

Affected Systems

Oracle MySQL Server and MySQL Cluster are affected. The vulnerable releases include MySQL Server versions 8.4.0‑8.4.12, 9.7.0‑9.7.3, and 26.7.0‑26.7.1, as well as MySQL Cluster versions 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.

Risk and Exploitability

The CVSS score of 4.9 reflects moderate severity, while the EPSS score is <1%, indicating a low probability of exploitation, and the vulnerability is not listed in CISA’s KEV catalog. The weakness corresponds to CWE‑284 and CWE‑400, allowing a network‑based attacker with high privileges to force resource exhaustion in the optimizer component, causing repeated crashes and service disruption without further privilege escalation.

Generated by OpenCVE AI on October 23, 2026 at 05:32 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade MySQL Server and MySQL Cluster to a release outside the affected ranges (e.g., 8.4.13 or later, 9.7.4 or later, 26.7.2 or later).
  • Limit high‑privileged network access to MySQL services by configuring firewalls and network segmentation.
  • Deploy application‑level health checks and monitor logs for abnormal hangs or crashes, and apply any vendor‑issued patches as soon as they become available.

Generated by OpenCVE AI on October 23, 2026 at 05:32 UTC.

Tracking

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Advisories

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History

Fri, 23 Oct 2026 02:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-399

Fri, 23 Oct 2026 00:45:00 +0000

Type Values Removed Values Added
Title Denial of Service via Optimizer Crash in MySQL Server and Cluster mysql: mysql: Denial of Service in Server Optimizer
Weaknesses CWE-400
References
Metrics threat_severity

None

 threat_severity

Moderate

Thu, 22 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-284
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 21 Oct 2026 04:00:00 +0000

Type Values Removed Values Added
Title Denial of Service via Optimizer Crash in MySQL Server and Cluster
Weaknesses CWE-399

Tue, 20 Oct 2026 21:30:00 +0000

Type Values Removed Values Added
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).
First Time appeared Oracle
Oracle mysql Cluster
Oracle mysql Server
CPEs cpe:2.3:a:oracle:mysql_cluster:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*
Vendors & Products Oracle
Oracle mysql Cluster
Oracle mysql Server
References
Metrics cvssV3_1

{'score': 4.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H'}

Subscriptions

Oracle Mysql Cluster Mysql Server
cve-icon MITRE

Status: PUBLISHED

Assigner: oracle

Published:

Updated: 2026-10-22T17:45:24.494Z

Reserved: 2026-09-28T15:40:09.502Z

Link: CVE-2026-101732

cve-icon Vulnrichment

Updated: 2026-10-22T17:43:42.877Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-20T22:18:28.077

Modified: 2026-10-28T20:21:39.683

Link: CVE-2026-101732

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-20T21:22:34Z

Links: CVE-2026-101732 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T05:45:12Z

Weaknesses
  • CWE-284

    Improper Access Control

  • CWE-400

    Uncontrolled Resource Consumption