# CVE-2026-101777: Oracle MySQL Server encryption denial of service and information disclosure

Source: https://junglewise.ai/threats/cve-2026-101777-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-2026-101777 · Severity: medium · CVSS 5.5 · Published 2026-10-20

A high-privileged attacker with network access to MySQL Server can exploit an encryption vulnerability to crash the database, causing complete service outage, or to read sensitive data stored within the database. This affects MySQL Server and MySQL Cluster, critical data storage components for many applications, and could result in significant business disruption or data breaches.

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-2026-101777 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-101777 being exploited in the wild.

**How severe is CVE-2026-101777?** Medium severity, with a CVSS score of 5.5, published 20 October 2026.

**Which products and versions are affected?** Oracle MySQL Server 9.7.0-9.7.3, 26.7.0-26.7.1; Oracle Mysql Cluster 9.7.0-9.7.3, 26.7.0-26.7.1.

**Is there a fix for CVE-2026-101777?** 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-2026-101777 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-101777?** 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 flaw in the MySQL Server encryption component allows a high-privileged attacker to cause a denial of service (persistent crash/hang) or unauthorized information disclosure through one of multiple network protocols. The vulnerability requires high privileges and network access but succeeds reliably against affected versions without additional user interaction.

## Affected products

- Oracle MySQL Server 9.7.0-9.7.3, 26.7.0-26.7.1
- Oracle MySQL Cluster 9.7.0-9.7.3, 26.7.0-26.7.1

## Timeline

- 2026-10-20: advisory

## References

- [https://www.oracle.com/security-alerts/cpuoct2026.html](https://www.oracle.com/security-alerts/cpuoct2026.html)

## Related threats

- [Oracle MySQL Server XML parsing privilege escalation](https://junglewise.ai/threats/cve-2026-101803-vulnerability-in-the-mysql-server-mysql-cluster-product-of)
- [Oracle MySQL Server parser denial of service](https://junglewise.ai/threats/cve-2026-101802-vulnerability-in-the-mysql-server-mysql-cluster-product-of)
- [Oracle MySQL Server Optimizer denial of service](https://junglewise.ai/threats/cve-2026-101801-vulnerability-in-the-mysql-server-mysql-cluster-product-of)
- [Oracle MySQL Server privilege escalation in Security: Privileges](https://junglewise.ai/threats/cve-2026-101800-vulnerability-in-the-mysql-server-mysql-cluster-product-of)
- [Oracle MySQL Server denial of service in Group Replication](https://junglewise.ai/threats/cve-2026-101799-vulnerability-in-the-mysql-server-mysql-cluster-product-of)