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

Impact

An availability‑only vulnerability is present in the MySQL Server and MySQL Cluster C APIs that allows an attacker with low privileges to cause the database to hang or crash. The flaw can be triggered by network traffic sent via any supported protocol, and the exploit is considered easily actionable. Successful exploitation results in a repeatable denial of service, disrupting legitimate database operations but not compromising confidentiality or integrity.

Affected Systems

Impact covers Oracle MySQL Server versions 8.4.0‑8.4.12, 9.7.0‑9.7.3, and 26.7.0‑26.7.1, as well as 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. These are the only releases listed as affected; any earlier or later releases are not reported as vulnerable.

Risk and Exploitability

The CVSS score of 6.5 indicates moderate severity, with the sole impact being availability. Because the attack vector is remote network access and the complexity is low, the risk is elevated for exposed database instances. EPSS indicates a probability of exploitation of less than 1%, suggesting a low likelihood of real-world attack, and the vulnerability is not currently listed in the CISA KEV catalog, implying no known active exploitation. The vulnerability can be leveraged by a low‑privileged user who can connect over the network using any supported protocol, thereby triggering a crash and causing a denial of service.

Generated by OpenCVE AI on October 23, 2026 at 05:33 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Update MySQL Server and MySQL Cluster to the latest releases that exclude the vulnerable 8.4.x, 9.7.x, 26.7.x lines and the 8.0.x for the cluster; Oracle publishes security patches in its October 2026 advisory.
  • Configure firewalls or security groups to restrict inbound traffic on the MySQL port(s) to trusted IP ranges and eliminate unnecessary low‑privileged remote access.
  • Enable detailed MySQL logging and monitor for repeated connections that result in hangs or crashes, and alert administrators when such patterns occur.

Generated by OpenCVE AI on October 23, 2026 at 05:33 UTC.

Tracking

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Advisories

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History

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

Type Values Removed Values Added
Weaknesses CWE-120
CWE-399

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

Type Values Removed Values Added
Title MySQL Server and Cluster Denial of Service via C API mysql: mysql: Denial of Service via the C API
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 02:15:00 +0000

Type Values Removed Values Added
Title MySQL Server and Cluster Denial of Service via C API
Weaknesses CWE-120
CWE-399

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: C API). 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: 2026-10-22T17:46:13.161Z

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

Link: CVE-2026-101726

cve-icon Vulnrichment

Updated: 2026-10-22T17:43:31.261Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-20T22:18:27.397

Modified: 2026-10-22T18:17:16.490

Link: CVE-2026-101726

cve-icon Redhat

Severity : Moderate

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

Links: CVE-2026-101726 - Bugzilla

cve-icon OpenCVE Enrichment

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

Weaknesses
  • CWE-284

    Improper Access Control

  • CWE-400

    Uncontrolled Resource Consumption