CVE-2026-101778: Medium severity Oracle MySQL Server vulnerability
Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Components Services). Supported versions that are affected are 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. Easily exploitable vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server, MySQL Cluster. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server, MySQL Cluster. CVSS 3.1 Base Score 6.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/mysql-9.7to a version that resolves this vulnerability.Fixed in 9.7.4-2
Event History
Frequently Asked Questions
Who can exploit this issue?
A low-privileged attacker with network access to the affected MySQL Server or MySQL Cluster instance can exploit it. No user interaction is required, and the issue is described as easily exploitable through multiple protocols.
What is the practical impact of a successful attack?
Successful exploitation can cause the affected MySQL Server or MySQL Cluster instance to hang or crash repeatedly, resulting in a complete denial of service. The provided impact information does not indicate confidentiality or integrity impact.
Which deployments should be prioritized for remediation?
Prioritize affected MySQL Server and MySQL Cluster systems that permit network access by low-privileged users. Affected versions include MySQL Server 8.4.0 through 8.4.12, 9.7.0 through 9.7.3, and 26.7.0 through 26.7.1; and MySQL Cluster 8.0.0 through 8.0.49, 8.4.0 through 8.4.12, 9.7.0 through 9.7.3, and 26.7.0 through 26.7.1.
What can be done while patching is pending?
Limit network access to affected instances and restrict low-privileged accounts where operationally possible, since exploitation requires both network access and low privileges. Monitor for unexplained server hangs or repeated crashes, which are the stated attack outcome.