Description
Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: InnoDB). 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

The vulnerability exists in the InnoDB storage engine of Oracle MySQL Server and MySQL Cluster. An attacker with high privileges who can reach the database services via any supported network protocol can deliberately cause the server or cluster to hang or crash repeatedly, resulting in a complete denial of service. The specification states no data is disclosed or altered, and based on the description we infer the impact is limited to availability.

Affected Systems

Affected products are 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; and 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. Administrators should verify their installations against these version ranges.

Risk and Exploitability

The CVSS v3.1 base score of 4.9 indicates a moderate impact on availability. The EPSS score of less than 1% denotes a very low probability of exploitation. The vulnerability is not listed in CISA’s KEV catalog. Since the exploit requires a high‑privileged attacker with network access, environments that grant such privileges over the database are at higher risk. No evidence suggests that the vulnerability could lead to data leakage or corruption.

Generated by OpenCVE AI on October 23, 2026 at 04:49 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the latest Oracle patch or upgrade to a non‑affected release of MySQL Server or MySQL Cluster.
  • Restrict inbound network access to the MySQL services so that only trusted hosts can communicate with the database, and ensure those hosts are granted only the minimal necessary privileges.
  • Implement high‑availability or failover configurations so that service interruption due to a crash can be mitigated quickly.
  • Consider disabling or limiting the database protocols that are not required in your environment to reduce attack surface.
  • Continuously monitor operational logs for signs of unexpected crashes or hangs to detect exploitation attempts promptly.

Generated by OpenCVE AI on October 23, 2026 at 04:49 UTC.

Tracking

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Advisories

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History

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

Type Values Removed Values Added
Title MySQL InnoDB Availability Vulnerability Exploitation via High-privileged Network Access mysql: mysql: Denial of Service in InnoDB
Weaknesses CWE-617
References
Metrics threat_severity

None

 threat_severity

Moderate

Thu, 22 Oct 2026 13:45:00 +0000

Type Values Removed Values Added
Title MySQL InnoDB Availability Vulnerability Exploitation via High-privileged Network Access

Thu, 22 Oct 2026 11:30:00 +0000

Type Values Removed Values Added
Title InnoDB Denial of Service in Oracle MySQL Server and Cluster
Weaknesses CWE-399

Wed, 21 Oct 2026 19:30:00 +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 01:00:00 +0000

Type Values Removed Values Added
Title InnoDB Denial of Service in Oracle MySQL Server and Cluster
Weaknesses 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: InnoDB). 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: 2026-10-21T18:37:27.608Z

Reserved: 2026-09-28T15:40:09.495Z

Link: CVE-2026-101621

cve-icon Vulnrichment

Updated: 2026-10-21T18:19:24.974Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-20T22:18:16.027

Modified: 2026-10-21T19:16:50.553

Link: CVE-2026-101621

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-20T21:21:56Z

Links: CVE-2026-101621 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T05:00:15Z

Weaknesses