Description
Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Pluggable Auth). 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 as well as unauthorized update, insert or delete access to some of MySQL Server, MySQL Cluster accessible data. CVSS 3.1 Base Score 6.5 (Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H).
Published: 2026-10-20
Score: 6.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Denial of Service and Unauthorized Data Modification
Action: Immediate Patch
AI Analysis

Impact

The vulnerability resides in the Pluggable Authentication component of Oracle MySQL Server and Cluster. An unauthenticated attacker can trigger a denial‑of‑service by causing the server to hang or repeatedly crash, and can also obtain the ability to update, insert, or delete data accessible through the affected databases. The weakness originates from improper authentication handling that allows bypass of credential checks (CWE‑303) and results in significant integrity and availability impacts.

Affected Systems

The flaw affects 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. All affected installations expose the vulnerabilities over network protocols.

Risk and Exploitability

The CVSS 3.1 base score of 6.5 indicates moderate severity focused on integrity and availability impacts. The EPSS score is < 1%, indicating a very low but non‑zero likelihood of exploitation. The vulnerability is not listed in the CISA KEV catalog, meaning no known exploits in the wild yet. The likely attack vector is network‑based, through any supported MySQL protocol, and requires no authentication, making it an easy target for attackers with network access. Successful exploitation can bring the database to a non‑responsive state and allow unauthorized modifications of data.

Generated by OpenCVE AI on October 23, 2026 at 01:39 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the latest Oracle MySQL release that contains the fix for the authentication flaw.
  • If immediate patching is not possible, restrict external access to MySQL ports by firewall or VPN so that only trusted hosts can reach the database, and disable unused authentication plugins.
  • Monitor database logs for failed authentication attempts, unexpected hangs, or data modification alerts, and enforce least‑privilege access control on database accounts.

Generated by OpenCVE AI on October 23, 2026 at 01:39 UTC.

Tracking

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Advisories

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History

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'}

Thu, 22 Oct 2026 16:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-284
CWE-287
CWE-770

Thu, 22 Oct 2026 12:30:00 +0000

Type Values Removed Values Added
Title Unauthenticated DoS and Data Modification in MySQL Server and Cluster mysql: mysql: Denial of service via Pluggable Authentication component
Weaknesses CWE-303
References
Metrics threat_severity

None

 threat_severity

Moderate

Wed, 21 Oct 2026 03:00:00 +0000

Type Values Removed Values Added
Title Unauthenticated DoS and Data Modification in MySQL Server and Cluster
Weaknesses CWE-284
CWE-287
CWE-770

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: Pluggable Auth). 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 as well as unauthorized update, insert or delete access to some of MySQL Server, MySQL Cluster accessible data. CVSS 3.1 Base Score 6.5 (Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/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:H/PR:N/UI:N/S:U/C:N/I:L/A:H'}

Subscriptions

Oracle Mysql Cluster Mysql Server
cve-icon MITRE

Status: PUBLISHED

Assigner: oracle

Published:

Updated: 2026-10-22T17:30:58.049Z

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

Link: CVE-2026-101774

cve-icon Vulnrichment

Updated: 2026-10-22T17:26:37.112Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-20T22:18:32.883

Modified: 2026-10-30T15:06:55.220

Link: CVE-2026-101774

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-20T21:22:51Z

Links: CVE-2026-101774 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T01:45:14Z

Weaknesses
  • CWE-284

    Improper Access Control

  • CWE-303

    Incorrect Implementation of Authentication Algorithm