CVE-2026-101628 in MySQL Cluster
Summary
by MITRE • 10/21/2026
Vulnerability in the MySQL Cluster product of Oracle MySQL (component: Cluster: NDB Operator). The supported version that is affected is 9.7.3. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise MySQL Cluster. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of 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).
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Analysis
by VulDB Data Team • 10/21/2026
The identified vulnerability resides within the NDB Operator component of Oracle MySQL Cluster, specifically affecting version 9.7.3. This software architecture is designed to provide high availability and data durability for distributed database environments, relying on a cluster of nodes that communicate via specific protocols. The flaw in question introduces a critical weakness in how the system handles incoming network requests processed by the NDB Operator. While the vulnerability does not directly compromise confidentiality or integrity, it severely impacts the availability of the service. An attacker with low privileges who has established network access to the MySQL Cluster environment can exploit this defect through HTTP-based interactions. The ease of exploitation is rated as high due to the lack of complex prerequisites such as user interaction or specific authentication tokens beyond basic network connectivity and minimal privilege levels, making it a significant risk for environments where internal segmentation may be lax or where low-privilege service accounts are compromised.
From a technical perspective, the vulnerability manifests as an ability to trigger a hang or a frequently repeatable crash of the MySQL Cluster process. This behavior is characteristic of resource exhaustion or state corruption issues often found in complex distributed systems handling concurrent connections and data operations. When triggered, the NDB Operator fails to recover gracefully, leading to a complete denial of service for the cluster node involved. In a clustered environment, this can have cascading effects depending on the redundancy configuration, potentially causing latency spikes across other nodes or requiring manual intervention to restart services. The impact is strictly categorized under availability because the attacker cannot read sensitive data nor modify it directly through this specific vector; however, the inability of legitimate users and applications to access the database constitutes a severe operational disruption that can lead to significant business downtime and loss of productivity.
This vulnerability aligns with Common Weakness Enumeration (CWE) categories related to resource management errors or improper input validation that leads to system instability. Specifically, it reflects issues where software does not properly manage resources during error conditions or under high load, leading to crashes. In the context of the MITRE ATT&CK framework, this exploit technique falls under Denial of Service (T1499), which involves actions intended to disrupt the availability of a service. The attack vector is classified as Network with Low Attack Complexity and requires Low Privileges, indicating that while it does not require deep system access initially, its impact on operational continuity is high. Security teams should recognize this as an active threat for any MySQL Cluster deployment running version 9.7.3 or potentially other affected versions if the flaw persists in subsequent releases without patching.
Mitigation strategies must prioritize immediate remediation through vendor-provided updates. Oracle has released patches addressing this vulnerability, and administrators are strongly advised to upgrade their MySQL Cluster installations to a fixed version as soon as possible. In scenarios where immediate patching is not feasible due to maintenance windows or compatibility concerns, temporary mitigations should be implemented at the network perimeter level. This includes restricting HTTP access to the NDB Operator ports to only trusted internal subnets and implementing strict rate limiting on incoming connections to mitigate the frequency of crash triggers. Additionally, deploying Web Application Firewalls with specific rules to detect anomalous request patterns associated with this exploit can provide an additional layer of defense. Regular monitoring for unusual spikes in connection attempts or service restarts should be established to ensure rapid detection if a patch cannot be applied immediately.