Description
Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Replication). 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 Now
AI Analysis

Impact

This vulnerability enables a high privileged attacker with network access to cause a hang or repeatable crash of the MySQL Server or MySQL Cluster, resulting in a complete denial of service. The flaw stems from uncontrolled crashes in the replication component, allowing the attacker to trigger an instability that brings the database services offline. While data integrity and confidentiality are unaffected, the availability of the database for all users and dependent applications is severely impaired.

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 are affected, as are 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.

Risk and Exploitability

The CVSS 3.1 base score of 4.9 indicates moderate impact with high privileges required and low attack complexity. The EPSS score indicates an exploitation probability below 1%, and the vulnerability is not listed in the CISA KEV catalog. The likely attack vector is network-based through multiple MySQL protocols, as the description states that high privileged attackers with network access can exploit the flaw to crash the services.

Generated by OpenCVE AI on October 23, 2026 at 02:30 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the latest official Oracle patch for MySQL Server, upgrading to at least version 8.4.13 or the latest 9.7.x/26.7.x releases, and for MySQL Cluster to at least version 8.0.50 or the latest 9.7.x/26.7.x releases.
  • If a patch cannot be applied immediately, restrict network access to MySQL services to trusted hosts only and limit connections from high‑privileged accounts to monitored environments.
  • Continuously monitor MySQL error logs and system metrics for abnormal crashes or hangs, and configure automatic restarts or fail‑over mechanisms to minimize service disruption.
  • Consider disabling or limiting replication if not needed, as the flaw is tied to the replication component.

Generated by OpenCVE AI on October 23, 2026 at 02:30 UTC.

Tracking

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Advisories

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History

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

Type Values Removed Values Added
Weaknesses CWE-400

Fri, 23 Oct 2026 02:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-400

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

Type Values Removed Values Added
Title Denial of Service via Uncontrolled Crashes in MySQL Server and Cluster mysql: mysql: Denial of Service via the Replication component
Weaknesses CWE-617
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 Denial of Service via Uncontrolled Crashes in 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: Replication). 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: 2026-10-22T17:46:05.280Z

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

Link: CVE-2026-101727

cve-icon Vulnrichment

Updated: 2026-10-22T17:43:33.002Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-20T22:18:27.507

Modified: 2026-10-22T18:17:16.627

Link: CVE-2026-101727

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-20T21:22:32Z

Links: CVE-2026-101727 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T02:45:03Z

Weaknesses