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: Patch
AI Analysis

Impact

A bug in the Optimizer component of Oracle MySQL Server and Cluster, identified as CWE-284 and CWE-835, allows an attacker with high privileges and network access to remotely trigger a crash or hang, resulting in a complete denial of service of the affected databases.

Affected Systems

Oracle MySQL Server versions 8.4.0‑8.4.12, 9.7.0‑9.7.3 and 26.7.0‑26.7.1 and Oracle 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 are vulnerable.

Risk and Exploitability

The CVSS base score of 4.9 indicates a low impact on availability, while the vector indicates that the exploit can be launched over the network (AV:N), requires low effort to execute (AC:L), and requires high privileges (PR:H). The EPSS score is below 1%, indicating a very low but nonzero probability of exploitation. The vulnerability is not listed in the CISA KEV catalog, so the current exploitation likelihood is low but uncertain.

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

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade MySQL Server and MySQL Cluster to the latest minor releases that obviate the Optimizer bug (for example, 8.4.13+, 9.7.4+, 26.7.2+, 8.0.50+).
  • Restrict network exposure of the MySQL Server and Cluster by applying firewall rules or VPN restrictions to limit traffic to trusted hosts.
  • Enforce the principle of least privilege on database accounts and disable unnecessary protocols or services that expose the optimizer functionality.

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

Tracking

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Advisories

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History

Fri, 23 Oct 2026 02:45:00 +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 Bug in Oracle MySQL Server and Cluster mysql: mysql: Denial of Service in the server optimizer
Weaknesses CWE-835
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 04:30:00 +0000

Type Values Removed Values Added
Title Denial of Service via Optimizer Bug in Oracle 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: 2026-10-22T17:20:09.293Z

Reserved: 2026-09-28T15:40:09.507Z

Link: CVE-2026-101798

cve-icon Vulnrichment

Updated: 2026-10-22T17:02:38.841Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-20T22:18:35.620

Modified: 2026-10-22T18:17:24.283

Link: CVE-2026-101798

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-20T21:23:00Z

Links: CVE-2026-101798 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T05:30:03Z

Weaknesses
  • CWE-284

    Improper Access Control

  • CWE-835

    Loop with Unreachable Exit Condition ('Infinite Loop')