# CVE-2026-101774: Oracle MySQL Server Pluggable Auth denial of service and data manipulation

Source: https://junglewise.ai/threats/cve-2026-101774-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-2026-101774 · Severity: medium · CVSS 6.5 · Published 2026-10-20

A vulnerability in Oracle MySQL Server and MySQL Cluster's authentication component allows an unauthenticated attacker on the network to crash the database or manipulate data without authorization. Exploitation can cause complete denial of service or unauthorized access to modify or delete database records, impacting business continuity and data integrity.

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-2026-101774 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-101774 being exploited in the wild.

**How severe is CVE-2026-101774?** 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-2026-101774?** 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-2026-101774 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-101774?** 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

The vulnerability exists in the Server: Pluggable Auth component and is difficult to exploit, requiring network access via multiple protocols but no prior authentication. An unauthenticated attacker can trigger a crash (DoS) or gain unauthorized write/delete access to accessible data. The issue affects multiple MySQL versions across Server and Cluster products; a fix is available in patched versions.

## 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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