CVE-2026-101637 in MySQL Cluster
Summary
by MITRE • 10/21/2026
Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: InnoDB). Supported versions that are affected are MySQL Server: 9.7.0-9.7.3, 26.7.0-26.7.1; MySQL Cluster: 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 as well as unauthorized update, insert or delete access to some of MySQL Server, MySQL Cluster accessible data. CVSS 3.1 Base Score 5.5 (Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H).
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Analysis
by VulDB Data Team • 10/21/2026
The identified vulnerability resides within the InnoDB storage engine of Oracle MySQL Server and MySQL Cluster products, specifically affecting versions 9.7.0 through 9.7.3 and 26.7.0 through 26.7.1. This flaw represents a significant security risk due to its potential for exploitation by high-privileged attackers who possess network access via multiple protocols. The core technical issue involves an improper handling of specific operations within the InnoDB engine, which can lead to severe stability and integrity failures. While the vulnerability requires high privileges to exploit initially, the ability to trigger these conditions remotely makes it a critical concern for database administrators managing exposed or improperly segmented MySQL instances.
From a technical perspective, the flaw allows an attacker with sufficient access rights to induce either a complete denial of service through repeated crashes or hangs, or to manipulate data integrity by performing unauthorized updates, inserts, or deletes on accessible tables. The presence of multiple protocols in the attack vector suggests that the vulnerability is not limited to standard SQL connections but may be triggered via other network interfaces supported by MySQL Cluster and Server configurations. This broadens the potential attack surface significantly compared to vulnerabilities restricted to a single protocol like TCP/IP for standard queries.
The operational impact of this vulnerability is twofold, encompassing both availability and integrity as reflected in its CVSS 3.1 base score of 5.5. The denial-of-service aspect means that database services can become unresponsive or crash entirely, disrupting business operations dependent on real-time data access. Simultaneously, the unauthorized modification capabilities pose a direct threat to data integrity, allowing an attacker to alter critical records without detection if proper auditing is not in place. This combination of impacts aligns with CWE-400, which describes resources not being properly controlled regarding their lifespan or availability, and CWE-269, indicating improper authorization checks that allow privilege escalation from a high-level account to perform unauthorized data modifications.
In terms of threat modeling, this vulnerability maps closely to MITRE ATT&CK techniques related to Denial of Service via service disruption and Data Manipulation through SQL injection-like behaviors or direct database API abuse. The requirement for network access classifies it under remote exploitation vectors, while the need for high privileges places it within lateral movement or privilege escalation scenarios where an attacker has already compromised a privileged account but seeks further impact on data reliability and system uptime.
Mitigation strategies should prioritize immediate patching to the latest stable versions of MySQL Server and MySQL Cluster that address this specific InnoDB flaw. Organizations must ensure that their update processes are tested in staging environments before deployment to production systems to avoid unintended compatibility issues. Additionally, network segmentation policies should be reviewed to restrict high-privileged database accounts from direct internet-facing access wherever possible. Implementing strict firewall rules to limit protocol exposure and enforcing multi-factor authentication for administrative accounts can further reduce the risk of exploitation by limiting the attack surface available to potential adversaries.