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: Server Crash or Hang
Action: Immediate Patch
AI Analysis

Impact

An flaw in the Optimizer component of Oracle MySQL Server and MySQL Cluster allows a high‑privileged attacker with network access to trigger a hang or crash, causing a complete denial of service. The vulnerability is easily exploitable and directly impacts availability, with no effect on confidentiality or integrity.

Affected Systems

Oracle MySQL Server and MySQL Cluster are affected. The vulnerable versions include MySQL Server 8.4.0 through 8.4.12, 9.7.0 through 9.7.3, and 26.7.0 through 26.7.1. MySQL Cluster is vulnerable in versions 8.0.0 through 8.0.49, 8.4.0 through 8.4.12, 9.7.0 through 9.7.3, and 26.7.0 through 26.7.1.

Risk and Exploitability

With a CVSS 3.1 base score of 4.9 and an attack vector that requires high‑privileged access over the network, the risk is moderate. The EPSS score of 0.0044 (<1%) indicates a very low exploit probability and the vulnerability is not listed in the CISA KEV catalogue. An attacker who can obtain elevated credentials or compromise a trusted network segment can repeatedly crash the database service, resulting in sustained denial of availability.

Generated by OpenCVE AI on October 23, 2026 at 01:45 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade to a MySQL Server or MySQL Cluster version outside the affected ranges, such as a newer release beyond 8.4.12, 9.7.3, or 26.7.1.
  • Apply any security patches released by Oracle for MySQL Server or MySQL Cluster following the Oracle CPUOct2026 advisory.
  • Restrict network access to MySQL endpoints to trusted hosts and enforce least‑privilege access controls to limit high‑privileged account exposure.

Generated by OpenCVE AI on October 23, 2026 at 01:45 UTC.

Tracking

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Advisories

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History

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

Type Values Removed Values Added
Title MySQL Server and Cluster Denial of Service via Optimizer Crash mysql: mysql: Denial of Service via Server Optimizer component
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 02:15:00 +0000

Type Values Removed Values Added
Title MySQL Server and Cluster Denial of Service via Optimizer Crash
Weaknesses CWE-400

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: 2026-10-22T17:45:38.448Z

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

Link: CVE-2026-101730

cve-icon Vulnrichment

Updated: 2026-10-22T17:43:38.736Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-20T22:18:27.850

Modified: 2026-10-22T18:17:17.053

Link: CVE-2026-101730

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-20T21:22:33Z

Links: CVE-2026-101730 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T02:00:16Z

Weaknesses
  • CWE-284

    Improper Access Control

  • CWE-400

    Uncontrolled Resource Consumption