CVE-2026-101731 Oracle Corporation CVE debrief

Who should care

Database administrators, security teams, and IT professionals responsible for MySQL Server and MySQL Cluster deployments should assess exposure and apply patches or mitigations as needed. This includes reviewing system configurations, monitoring for suspicious activity, and ensuring that all necessary security measures are in place.

Why it matters

CVE-2026-101731 is a medium-severity vulnerability in MySQL Server and MySQL Cluster that allows high-privileged attackers to cause a denial of service. Database administrators and security teams should assess exposure and apply patches or mitigations as needed.

• Potential denial of service (DOS) attacks against MySQL Server and MySQL Cluster
• Compromise of MySQL Server and MySQL Cluster by high-privileged attackers
• Unauthorized ability to cause a hang or frequently repeatable crash of MySQL Server and MySQL Cluster

Technical summary

The vulnerability is in the Server: Optimizer component of MySQL Server and MySQL Cluster. It allows high-privileged attackers with network access via multiple protocols to compromise MySQL Server and MySQL Cluster, resulting in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server and MySQL Cluster. The vulnerability affects several versions of MySQL Server and MySQL Cluster, including 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.

Defensive priority

Medium

Recommended defensive actions

• Review and apply patches for MySQL Server and MySQL Cluster
• Restrict network access to high-privileged users
• Monitor for potential DOS attacks
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, its impact, and affected versions. The vulnerability is in the Server: Optimizer component of MySQL Server and MySQL Cluster. CVSS 3.1 Base Score 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H). The CVE record was published on 2026-10-20T22:18:27.960Z and has not been modified since then.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.