Quick answers
- Is CVE-2026-101801 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-101801 being exploited in the wild.
- How severe is CVE-2026-101801?
- 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-2026-101801?
- 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-2026-101801 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-101801?
- 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 exists in the Server: Optimizer component of MySQL Server and MySQL Cluster. The vulnerability requires high privilege authentication and network access, allowing an attacker to send a crafted query that causes a hang or crash of the database. Versions up to 8.4.12, 9.7.3, and 26.7.1 are affected; patched versions are available.
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