Description
Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Components Services). 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. Difficult to exploit vulnerability allows unauthenticated 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 5.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).
Published: 2026-10-20
Score: 5.9 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Denial of Service
Action: Patch Immediately
AI Analysis

Impact

The CVE details a vulnerability in the Oracle MySQL Server and MySQL Cluster that is difficult to exploit but enables an unauthenticated attacker with network access to trigger a hang or a frequent crash of the database service. The failure results in a complete denial of service, impacting availability while leaving confidentiality and integrity untouched. Based on the description, it is inferred that the flaw arises from improper handling of data over multiple network protocols, which culminates in an unhandled error that terminates the service.

Affected Systems

Affected products include Oracle MySQL Server and Oracle MySQL Cluster. The vulnerable release ranges are 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; and 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. These versions are supported by Oracle and require an update to prevent the Denial of Service attack.

Risk and Exploitability

The CVSS base score of 5.9 indicates a moderate severity with a high impact on system availability. The vulnerability is accessible over the network (AV:N) without authentication (PR:N) and does not require user interaction (UI:N). The EPSS score is < 1%, indicating a very low but nonzero exploitation probability, and the vulnerability has not been listed in the CISA KEV catalog, suggesting no confirmed exploitation yet. Nevertheless, the combination of network exposure and the ability to cause a crash means that users running these versions should prioritize applying the vendor’s fix and consider network hardening measures. The risk remains moderate to high until the patch is deployed.

Generated by OpenCVE AI on October 23, 2026 at 05:58 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the Oracle MySQL Server and MySQL Cluster patches released in the October 2026 Critical Patch Update to disable the flaw that allows the unauthenticated attacker to cause a crash, thereby addressing the CWE-284 (Improper Access Control) and CWE-770 (Out‑of‑bounds Write) weaknesses.
  • Configure firewall or network segmentation to limit inbound traffic to the MySQL ports (default 3306) to trusted hosts only, reducing exposure to the improper access control weakness (CWE-284).
  • Monitor database logs and system metrics for sudden hangs or crash events to detect exploitation attempts early, as the denial of service attack will exhibit such behavior.

Generated by OpenCVE AI on October 23, 2026 at 05:58 UTC.

Tracking

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Advisories

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History

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

Type Values Removed Values Added
Weaknesses CWE-400
CWE-749

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

Type Values Removed Values Added
Title Unauthenticated Network Denial of Service in Oracle MySQL Server and Cluster mysql: mysql: Denial of Service via Server Components Services
Weaknesses CWE-770
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 02:45:00 +0000

Type Values Removed Values Added
Title Unauthenticated Network Denial of Service in Oracle MySQL Server and Cluster
Weaknesses CWE-400
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: Components Services). 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. Difficult to exploit vulnerability allows unauthenticated 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 5.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/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': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/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: 2026-10-22T17:21:07.832Z

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

Link: CVE-2026-101788

cve-icon Vulnrichment

Updated: 2026-10-22T17:02:25.980Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-20T22:18:34.517

Modified: 2026-10-22T18:17:23.460

Link: CVE-2026-101788

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-20T21:22:56Z

Links: CVE-2026-101788 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T06:00:13Z

Weaknesses
  • CWE-284

    Improper Access Control

  • CWE-770

    Allocation of Resources Without Limits or Throttling