Description
Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Group Replication GCS). 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 (service availability)
Action: Apply Patch
AI Analysis

Impact

A flaw in MySQL Server and MySQL Cluster Group Replication GCS lets a high‑privileged attacker with network access cause a hang or repeatable crash. The vulnerability is tied to multiple weaknesses including improper input validation (CWE-400) and missing authentication or authorization controls (CWE-284). The exploitation results in a denial of service without affecting data integrity or confidentiality.

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 vulnerable. MySQL Cluster releases 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 impacted. All other MySQL Server and Cluster versions are not listed as affected.

Risk and Exploitability

The CVSS v3.1 base score of 4.9 reflects a moderate severity focused on availability. The EPSS score of < 1 % indicates a very low but non‑zero likelihood of exploitation, and the vulnerability is not listed in CISA’s KEV catalog. The attack requires high privileges and network connectivity to the MySQL Service or Cluster; it does not allow code execution or data exposure, but repeated crashes can disrupt business continuity, especially in distributed environments with multiple replicas.

Generated by OpenCVE AI on October 23, 2026 at 05:30 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade MySQL Server and MySQL Cluster to versions that exclude 8.4.0‑8.4.12, 9.7.0‑9.7.3 and 26.7.0‑26.7.1; apply the latest public releases per the Oracle advisory.
  • Restrict network access to the MySQL endpoints and limit protocols that reach Group Replication GCS. Apply firewall or segmentation rules to reduce the attack surface required for exploitation.
  • Enable monitoring for repeated crashes and configure automated recovery or restart procedures to minimize downtime in affected environments.

Generated by OpenCVE AI on October 23, 2026 at 05:30 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-1103
CWE-911

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

Type Values Removed Values Added
Title mysql: mysql: Denial of Service in Group Replication
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 04:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-1103
CWE-911

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: Group Replication GCS). 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: 2026-10-22T17:32:28.274Z

Reserved: 2026-09-28T15:40:09.504Z

Link: CVE-2026-101751

cve-icon Vulnrichment

Updated: 2026-10-22T17:26:13.327Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-20T22:18:30.200

Modified: 2026-10-28T18:50:09.227

Link: CVE-2026-101751

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-20T21:22:41Z

Links: CVE-2026-101751 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T05:45:12Z

Weaknesses
  • CWE-284

    Improper Access Control

  • CWE-400

    Uncontrolled Resource Consumption