Is CVE-2026-101787 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-101787 being exploited in the wild.

How severe is CVE-2026-101787?

Medium severity, with a CVSS score of 4.9, 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-2026-101787?

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-2026-101787 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-101787?

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.

CVE-2026-101787: Oracle MySQL Server denial of service in Optimizer component

CVE-2026-101787 · Severity: medium · CVSS 4.9 · Published 2026-10-20

MySQL Server and MySQL Cluster are database engines used by organizations to store and retrieve critical data. A high-privileged attacker with network access can trigger a crash or hang in the database, causing a complete denial of service. This prevents applications and users from accessing the database until it is manually restarted.

Technologies: Oracle MySQL Server, Oracle Mysql Cluster. Vendors: Oracle.

Quick answers

Is CVE-2026-101787 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-101787 being exploited in the wild.
How severe is CVE-2026-101787?: Medium severity, with a CVSS score of 4.9, 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-2026-101787?: 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-2026-101787 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-101787?: 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

An easily exploitable vulnerability in the MySQL Server Optimizer component allows a high-privileged attacker with network access via multiple protocols to cause a denial of service. The attack results in a hang or crash of the database server with no impact to confidentiality or integrity, only availability. A fix is available in patched versions of MySQL Server and Cluster.

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

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.