Description
Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Security: Encryption). 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: Apply Patch
AI Analysis

Impact

This vulnerability exists in the encryption handling component of Oracle MySQL Server and Cluster. It allows an unauthenticated attacker with network access to trigger a hang or a repeatable crash, effectively denying service to legitimate users. It is a denial of service flaw that also involves improper access control (CWE-284) and resource exhaustion (CWE-770). The weakness can be exploited through multiple network protocols, and a successful attack results in a complete denial of availability for the affected database instance.

Affected Systems

Affected products are 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 Oracle MySQL Cluster versions 8.0.0‑8.0.49, 8.4.0‑8.4.12, 9.7.0‑9.7.3, 26.7.0‑26.7.1. No other versions were identified as impacted.

Risk and Exploitability

The CVSS base score of 5.9 highlights a moderate severity focused on availability. The EPSS score of <1% indicates a low, but not zero, probability of exploitation. The vulnerability is not included in CISA’s KEV catalog, implying no confirmed widespread exploitation to date. Because the flaw can be triggered by an unauthenticated attacker over the network using standard database protocols, the threat landscape remains relevant for any organization still running the affected releases.

Generated by OpenCVE AI on October 23, 2026 at 05:28 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Install Oracle supplied patches or upgrade to MySQL Server 8.4.13, 9.7.4, 26.7.2, or later, and to MySQL Cluster 8.0.50, 8.4.13, 9.7.4, 26.7.2 or later, which contain the fix for the encryption handling flaw.
  • Reduce the attack surface by disabling unused database networking protocols and restricting inbound connections to trusted hosts only.
  • Enable detailed audit logging for connection attempts and monitor for abnormal database activity to detect and respond to potential DoS attempts.

Generated by OpenCVE AI on October 23, 2026 at 05:28 UTC.

Tracking

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Advisories

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History

Fri, 23 Oct 2026 02:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-400
CWE-785

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

Type Values Removed Values Added
Title MySQL Server/Cluster Vulnerability Allowing Unauthenticated DoS via Network mysql: mysql: Denial of Service via security encryption component
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 04:00:00 +0000

Type Values Removed Values Added
Title MySQL Server/Cluster Vulnerability Allowing Unauthenticated DoS via Network
Weaknesses CWE-400
CWE-785

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: Security: Encryption). 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: 2026-10-22T17:31:40.682Z

Reserved: 2026-09-28T15:40:09.505Z

Link: CVE-2026-101761

cve-icon Vulnrichment

Updated: 2026-10-22T17:26:26.599Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-20T22:18:31.360

Modified: 2026-10-30T14:27:32.320

Link: CVE-2026-101761

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-20T21:22:46Z

Links: CVE-2026-101761 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T05:30:03Z

Weaknesses
  • CWE-284

    Improper Access Control

  • CWE-770

    Allocation of Resources Without Limits or Throttling