CVE-2026-61109 Denial of service in MySQL Cluster

Medium 6.5 Published 21 Jul 2026 Updated 23 Jul 2026

A low-privileged attacker can cause a complete denial of service in MySQL Server and Cluster via the JSON component.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-61109?

CVE-2026-61109 is a medium-severity denial of service vulnerability in Oracle Mysql Cluster, published on 21 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: JSON). Supported versions that are affected are MySQL Server: 8.4.0-8.4.10, 9.7.0-9.7.1; MySQL Cluster: 8.0.0-8.0.47, 8.4.0-8.4.10 and 9.7.0-9.7.1. 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).

Weakness: CWE-400

Which versions are affected by CVE-2026-61109?

It affects 2 products.

Products include Oracle Mysql Cluster, Oracle Mysql Server.

How do I fix CVE-2026-61109?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-61109 being exploited?

There is no known exploitation of CVE-2026-61109 in the wild and no public exploit code.

All Oracle Mysql Cluster vulnerabilities

Sources

Also known as AZL-110043, AZL-110145, AZL-110244, GHSA-72pw-r4f3-922c, MINI-5jrr-5f7c-cjhc, MINI-6p74-wrh3-5fjc and 8 more.