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: Availability
Action: Upgrade
AI Analysis

Impact

This vulnerability is in the Optimizer component of Oracle MySQL Server and MySQL Cluster. A high‑privileged attacker with network access can trigger a crash or hang, resulting in a denial‑of‑service that renders the database unavailable. The weakness is a failure to handle optimizer logic properly, causing a loss of availability but no impact on confidentiality or integrity.

Affected Systems

Oracle MySQL Server versions 8.4.0 through 8.4.12, 9.7.0 through 9.7.3, and 26.7.0 through 26.7.1, along with Oracle MySQL Cluster 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, are vulnerable.

Risk and Exploitability

The CVSS 3.1 Base Score of 4.9 indicates a moderate severity that affects only availability. The EPSS score of less than 1% suggests a very low probability of exploitation in the wild, and the vulnerability is not listed in CISA KEV. The likely attack requires a user with elevated privileges who can authenticate to the database, then issue a query that exercises the broken optimizer path, leading to a crash. Once the crash occurs, the service remains unavailable until it is manually restarted or patched.

Generated by OpenCVE AI on October 23, 2026 at 02:49 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade all affected MySQL Server and MySQL Cluster installations to versions beyond the affected ranges (e.g., MySQL Server ≥8.4.13, 9.7.4, 26.7.2; MySQL Cluster ≥8.0.50, 8.4.13, 9.7.4, 26.7.2).
  • Enforce strict authentication and restrict network access to MySQL ports so that only authorized hosts and role‑based accounts can reach the database.
  • Deploy service monitoring and automatic restart mechanisms to mitigate the impact if a crash is triggered, ensuring rapid service recovery while the patch is applied.

Generated by OpenCVE AI on October 23, 2026 at 02:49 UTC.

Tracking

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Advisories

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History

Fri, 23 Oct 2026 03:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-749

Fri, 23 Oct 2026 02:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-749

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 query 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 03:45:00 +0000

Type Values Removed Values Added
Title Denial of Service via Optimizer Crash in MySQL Server and Cluster
Weaknesses CWE-749

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: 2026-10-22T17:21:33.596Z

Reserved: 2026-09-28T15:40:09.506Z

Link: CVE-2026-101784

cve-icon Vulnrichment

Updated: 2026-10-22T17:02:20.089Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-20T22:18:34.047

Modified: 2026-10-22T18:17:23.037

Link: CVE-2026-101784

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-20T21:22:54Z

Links: CVE-2026-101784 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T03:00:11Z

Weaknesses
  • CWE-284

    Improper Access Control

  • CWE-400

    Uncontrolled Resource Consumption

  • CWE-749

    Exposed Dangerous Method or Function