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 low 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 6.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Published: 2026-10-20
Score: 6.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Denial of Service
Action: Apply patch
AI Analysis

Impact

The vulnerability resides in the Optimizer component of MySQL Server and MySQL Cluster, enabling a low‑privileged attacker with network access to cause the database to hang or crash, resulting in a complete denial of service. The weakness is an optimizer bug that can be triggered via standard MySQL protocols, impacting availability while leaving confidentiality and integrity unaffected.

Affected Systems

Affected products include 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, as well as Oracle MySQL Cluster versions 8.0.0 to 8.0.49, 8.4.0 to 8.4.12, 9.7.0 to 9.7.3 and 26.7.0 to 26.7.1.

Risk and Exploitability

The CVSS score is 6.5 with a network access vector, low attack complexity, low privileges, and no user interaction. The EPSS score is unavailable, so the exact exploitation probability is unknown. The risk is moderate, with the vulnerability not listed in CISA KEV. Attack requires only network access through supported protocols and a low‑privileged client; a successful attack terminates the server process, causing a total service interruption.

Generated by OpenCVE AI on October 21, 2026 at 00:42 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the latest Oracle MySQL Server or Cluster patch that removes the optimizer bug
  • Limit external network access to the MySQL instances, allowing connections only from trusted hosts or through a firewall
  • Enable monitoring of MySQL logs and system metrics to detect repeated crashes or hang events promptly

Generated by OpenCVE AI on October 21, 2026 at 00:42 UTC.

Tracking

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Advisories

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History

Thu, 05 Nov 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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

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

Type Values Removed Values Added
Title Denial of Service via Optimizer Bug in Oracle MySQL Server and Cluster mysql: mysql: Denial of Service via Server Optimizer component
References
Metrics threat_severity

None

 threat_severity

Moderate

Wed, 21 Oct 2026 01:00:00 +0000

Type Values Removed Values Added
Title Denial of Service via Optimizer Bug in Oracle MySQL Server and Cluster
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 low 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 6.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/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': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/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: 2026-11-05T16:07:15.225Z

Reserved: 2026-09-28T15:40:09.494Z

Link: CVE-2026-101608

cve-icon Vulnrichment

Updated: 2026-11-05T15:57:50.204Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-20T22:18:14.550

Modified: 2026-11-05T17:17:30.730

Link: CVE-2026-101608

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-20T21:21:51Z

Links: CVE-2026-101608 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-22T16:45:08Z

Weaknesses
  • CWE-400

    Uncontrolled Resource Consumption