CVE-2026-101623: Medium severity Oracle MySQL Server vulnerability
Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Optimizer). 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 high 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 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/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 is realistically exposed to this issue?
MySQL Server and MySQL Cluster deployments are affected only in the listed version ranges. Exploitation requires a high-privileged attacker with network access to the service via multiple protocols.
What is the expected impact of successful exploitation?
A successful attack can cause the affected MySQL Server or MySQL Cluster instance to hang or crash repeatedly, resulting in a complete denial of service. The provided CVSS vector identifies no confidentiality or integrity impact.
Does exploitation require user interaction or difficult attack conditions?
No user interaction is required, and the attack complexity is rated low. However, the attacker must already hold high privileges and have network access.
Which versions should be checked during triage?
Check MySQL Server 8.4.0 through 8.4.12, 9.7.0 through 9.7.3, and 26.7.0 through 26.7.1. For MySQL Cluster, check 8.0.0 through 8.0.49 as well as 8.4.0 through 8.4.12, 9.7.0 through 9.7.3, and 26.7.0 through 26.7.1.