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

Impact

The vulnerability exists in the JSON component of MySQL Server and MySQL Cluster. An attacker with low privileges and network access can send crafted JSON through any supported protocol, causing the server to hang or crash repeatedly. This results in a denial of availability for applications relying on the database.

Affected Systems

Oracle Corporation products MySQL Server and MySQL Cluster are impacted. Affected MySQL Server versions include 8.4.0 through 8.4.12, 9.7.0 through 9.7.3, and 26.7.0 through 26.7.1. 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 are also affected.

Risk and Exploitability

The CVSS 3.1 base score of 6.5 indicates a moderate severity availability impact. Attack vectors are network‑based with low privilege and no user interaction required. The EPSS score is < 1%, indicating a very low probability of exploitation, but the vulnerability is still exploitable with only network connectivity and crafted input. The vulnerability is not listed in the CISA KEV catalog. Because the flaw permits the attacker to repeatedly crash or hang the database, it can disrupt critical services and must be addressed promptly.

Generated by OpenCVE AI on October 23, 2026 at 05:32 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the Oracle patch updates that address MySQL Server and MySQL Cluster versions 8.4.0‑8.4.12, 9.7.0‑9.7.3, 26.7.0‑26.7.1 and/or higher as published in Oracle Critical Patch Update Oct‑2026.
  • Configure firewall or network controls to restrict incoming connections to the MySQL ports to trusted sources, thereby limiting the attack surface until the patch is applied.
  • Monitor MySQL logs for repeated crash or hang events and alert if such patterns emerge, indicating a potential attempt or exploitation.

Generated by OpenCVE AI on October 23, 2026 at 05:32 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

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

Type Values Removed Values Added
Weaknesses CWE-400

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

Type Values Removed Values Added
Title Denial‑of‑Service via JSON Parsing Vulnerability in Oracle MySQL Server and Cluster mysql: mysql: Denial of Service via JSON component
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 Denial‑of‑Service via JSON Parsing Vulnerability in Oracle MySQL Server and Cluster
Weaknesses CWE-20
CWE-400

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: JSON). 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: 2026-10-22T17:45:18.279Z

Reserved: 2026-09-28T15:40:09.503Z

Link: CVE-2026-101733

cve-icon Vulnrichment

Updated: 2026-10-22T17:43:45.484Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-20T22:18:28.193

Modified: 2026-10-28T18:54:43.440

Link: CVE-2026-101733

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-20T21:22:35Z

Links: CVE-2026-101733 - Bugzilla

cve-icon OpenCVE Enrichment

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

Weaknesses
  • CWE-20

    Improper Input Validation

  • CWE-284

    Improper Access Control