CVE-2026-21929 is a medium-severity vulnerability affecting the MySQL Server product of Oracle MySQL. This vulnerability exists within the Server: Parser component and affects supported versions from 9.0.0 to 9.5.0. It is classified as a difficult-to-exploit vulnerability that allows low privileged attackers with network access via multiple protocols to compromise the MySQL Server. Successful exploitation of this vulnerability can lead to unauthorized abilities to cause a hang or frequent crashes, leading to a complete denial of service (DoS) of the MySQL Server.
The CVSS 3.1 base score assigned to this vulnerability is 5.3, indicating a medium level of severity with a significant impact on availability. The CVSS vector indicates that the attack vector is network-based, with high attack complexity and low privileges required for exploitation. The absence of user interaction and no confidentiality or integrity impacts further characterize this vulnerability.
Organizations utilizing the affected versions should prioritize patching immediately as the consequences of exploitation can lead to critical downtime and operational disruptions. Given the nature of this vulnerability, effective remediation is crucial to maintain the availability of MySQL services.
As of the latest update, there is no public exploit confirmed for this vulnerability, and it has not been included in the Known Exploited Vulnerabilities (KEV) catalog, indicating that while it poses a risk, it is not actively exploited in the wild.
Vulnerability Details
The vulnerability in question allows attackers to potentially create a denial of service scenario on the MySQL Server. The affected versions range from 9.0.0 to 9.5.0, and the vulnerability has been analyzed and documented by Oracle. The specific vulnerability type is not classified under a known Common Weakness Enumeration (CWE) category.
Technical Analysis
The root cause of CVE-2026-21929 stems from the MySQL Server's handling of requests that may lead to resource exhaustion. The attack vector leverages network protocols to access the server, and given that the complexity of the attack is high, it typically requires specific conditions to be met for exploitation.
In terms of privileges required, a low level of access is needed, meaning that an attacker does not need administrative rights to initiate an attack. User interaction is not required, thus making the vulnerability easier to exploit for malicious entities. The impacts on availability are significant, as successful exploitation can lead to service interruptions.
Risk & Impact Analysis
The risk to organizations includes potential downtime due to service disruptions. Given the reliance on MySQL for critical applications, the blast radius of this vulnerability could be quite extensive, affecting multiple services that rely on database availability. Organizations should assess the urgency of addressing this vulnerability based on their operational needs and the potential impact on their business continuity.
Given the medium CVSS score of 5.3, organizations should address this vulnerability in their priority patch cycle, ensuring that the MySQL Server is updated to a secure version to mitigate risks.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected products include Oracle MySQL Server versions 9.0.0 through 9.5.0. Organizations using these versions should ensure they are updated to the latest version to mitigate the risk associated with this vulnerability.
Mitigation & Remediation
Organizations should prioritize applying the available patches to remediate this vulnerability. Specific version information should be referenced in Oracle's vendor advisory. If immediate patching is not feasible, organizations should consider implementing network controls to limit access to the MySQL Server, ensuring that only trusted networks can interact with the database.
For comprehensive security, organizations can also benefit from engaging in penetration testing to identify additional security gaps.
Detection Guidance
Monitoring logs for unusual behavior or repeated error messages associated with the MySQL Server can help identify potential exploitation attempts. Behavioral anomalies such as sudden spikes in resource usage or network traffic directed at the MySQL service should also be logged and investigated.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2026-21929 lies in its representation of the challenges faced in the management of database services in networked environments. Security teams must remain vigilant about the evolving threat landscape and continuously assess their configurations against potential vulnerabilities.
This vulnerability highlights the need for organizations to not only patch known vulnerabilities promptly but also to engage in proactive security measures such as the implementation of comprehensive security assessments. For further reading on best practices, organizations can refer to our penetration testing methodology documentation and consider our vulnerability management program design services to strengthen their overall security posture.
Moreover, understanding the patterns associated with vulnerabilities similar to CVE-2026-21929 can lead to improved defensive strategies. For insights into recent trends, organizations are encouraged to explore our 2026 ransomware targeting trends article.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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