# CVE-2026-101780: Oracle MySQL Server denial of service in X Plugin

Source: https://junglewise.ai/threats/cve-2026-101780-vulnerability-in-the-mysql-server-mysql-cluster-product-of  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-20. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-101780 · Severity: medium · CVSS 6.5 · Published 2026-10-20

Oracle MySQL Server and MySQL Cluster are database products used to store and manage critical business data. A vulnerability in the X Plugin component allows a low-privileged attacker with network access to crash the database repeatedly, causing complete unavailability. This denial-of-service attack requires no special techniques and can be launched by someone with basic database credentials.

Technologies: [Oracle MySQL Server](https://junglewise.ai/threats/technologies/mysql-server), [Oracle Mysql Cluster](https://junglewise.ai/threats/technologies/mysql-cluster). Vendors: [Oracle](https://junglewise.ai/threats/vendors/oracle).

## Quick answers

**Is CVE-2026-101780 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-101780 being exploited in the wild.

**How severe is CVE-2026-101780?** Medium severity, with a CVSS score of 6.5, published 20 October 2026.

**Which products and versions are affected?** Oracle MySQL Server 8.4.0-8.4.12, 9.7.0-9.7.3, 26.7.0-26.7.1; Oracle Mysql Cluster 8.0.0-8.0.49, 8.4.0-8.4.12, 9.7.0-9.7.3, 26.7.0-26.7.1.

**Is there a fix for CVE-2026-101780?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-101780 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-101780?** Check whether you run Oracle MySQL Server or Oracle Mysql Cluster at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A denial-of-service vulnerability in the X Plugin component of MySQL Server and MySQL Cluster can be exploited by a low-privileged network attacker to trigger a hang or crash of the database server. The attack requires only low privileges and network access via multiple protocols, and it is easily exploitable with no user interaction required. Successful exploitation results in a complete denial of service with no data compromise.

## Affected products

- Oracle MySQL Server 8.4.0-8.4.12, 9.7.0-9.7.3, 26.7.0-26.7.1
- Oracle MySQL Cluster 8.0.0-8.0.49, 8.4.0-8.4.12, 9.7.0-9.7.3, 26.7.0-26.7.1

## Timeline

- 2026-10-20: disclosed

## References

- [https://www.oracle.com/security-alerts/cpuoct2026.html](https://www.oracle.com/security-alerts/cpuoct2026.html)

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- [Oracle MySQL Server denial of service in Group Replication](https://junglewise.ai/threats/cve-2026-101799-vulnerability-in-the-mysql-server-mysql-cluster-product-of)