CVE-2026-101678 in MySQL Connectors
Summary
by MITRE • 10/21/2026
Vulnerability in the MySQL Connectors product of Oracle MySQL (component: Connector/J). The supported version that is affected is 26.7.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise MySQL Connectors. Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of MySQL Connectors. CVSS 3.1 Base Score 4.3 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L).
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Analysis
by VulDB Data Team • 10/21/2026
The identified vulnerability resides within the Connector/J component of Oracle MySQL Connectors, specifically affecting version 26.7.0 and potentially other supported releases in that lineage. This software serves as a critical bridge allowing Java-based applications to communicate with MySQL database servers via the JDBC API. The flaw is characterized by an easily exploitable condition that permits unauthenticated attackers to initiate attacks over multiple network protocols without requiring prior authentication credentials. While the vulnerability does not currently allow for direct remote code execution or data exfiltration, it presents a significant risk to system availability and operational continuity.
From a technical perspective, this issue aligns with CWE-400, which describes uncontrolled resource consumption leading to denial of service conditions. The attacker can trigger specific behaviors within the Connector/J library that cause excessive allocation of memory or processing resources on the target machine running the Java application. This resource exhaustion prevents the legitimate user processes from accessing necessary system resources, thereby degrading performance or causing complete failure of the database connection layer. The vulnerability is classified under CVSS 3.1 with a base score of 4.3, indicating medium severity primarily driven by impacts on availability rather than confidentiality or integrity.
The operational impact of this vulnerability centers on partial denial of service conditions within MySQL Connectors. When exploited, the affected Java applications may become unresponsive, crash, or fail to process legitimate database requests effectively. This disruption can cascade into broader application failures if the backend services rely heavily on continuous connectivity with the MySQL database. Organizations utilizing these connectors for high-traffic web applications or critical data processing pipelines face potential downtime and loss of service availability during periods when the vulnerability is actively exploited by malicious actors targeting their infrastructure.
A unique characteristic of this exploit vector is the requirement for human interaction from a person other than the attacker to achieve successful exploitation. This suggests that the attack may involve social engineering tactics, such as tricking an administrator or developer into executing a crafted script, opening a malicious file containing vulnerable code paths, or interacting with a compromised interface that triggers the resource exhaustion flaw. Consequently, while the technical exploit is straightforward for those who can trigger it, the barrier to entry includes convincing a human user to perform specific actions that initiate the vulnerability chain.
In terms of threat modeling and industry standards, this scenario maps closely to ATT&CK technique T1496, which covers Resource Hijacking or Denial of Service through resource exhaustion. The attack vector is classified as Network Accessible with Low Attack Complexity but requires User Interaction, reflecting its reliance on social engineering elements despite being technically simple once triggered. Security teams should recognize that while the CVSS score suggests moderate risk, the potential for service disruption in production environments warrants immediate attention to mitigate availability risks.
To address this vulnerability, organizations must prioritize patching Oracle MySQL Connectors to a version where the flaw has been remediated by the vendor. Regularly updating connector libraries ensures that known resource management bugs are resolved before they can be leveraged against live systems. Additionally, implementing strict input validation and sanitization protocols for any user-supplied data processed by Java applications connecting to databases can reduce the attack surface. Deploying web application firewalls or intrusion detection systems capable of identifying patterns associated with resource exhaustion attacks may also provide an additional layer of defense against exploitation attempts that rely on human interaction triggers.