Quick answers
- Is CVE-2026-101784 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-101784 being exploited in the wild.
- How severe is CVE-2026-101784?
- 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-2026-101784?
- 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-2026-101784 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-101784?
- 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 Server: Optimizer component allows a high-privileged attacker with network access to trigger a hang or crash of MySQL Server or MySQL Cluster. The vulnerability requires high privilege level and can be exploited via multiple protocols, resulting in unavailability of the database service.
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