CVE-2026-21949 is a vulnerability in the MySQL Server product of Oracle MySQL, specifically affecting versions 9.0.0 through 9.5.0. This vulnerability allows low privileged attackers with network access via multiple protocols to exploit the MySQL Server. The vulnerability is classified as having a CVSS 3.1 Base Score of 6.5, signifying medium severity with a notable impact on availability. Successful exploitation can lead to a denial of service (DoS), causing the MySQL Server to hang or crash repeatedly.
The urgency for organizations to address this vulnerability is high. Given the potential for service disruption, it is crucial for defenders to implement patches as soon as possible. The risk to organizations includes unauthorized access leading to service outages, which could affect client operations and overall business functionality.
No public exploit has been confirmed as of the latest update. Organizations are encouraged to monitor for any developments related to this CVE and ensure their systems are updated in accordance with Oracle's advisories.
Organizations should prioritize patching immediately to mitigate the risks associated with this vulnerability.
Vulnerability Details
The vulnerability is characterized as an easily exploitable condition that impacts the availability of the MySQL Server. The affected versions are clearly specified as 9.0.0 to 9.5.0. The official CVE description outlines that this vulnerability falls under CWE-400, indicating an issue related to resource exhaustion.
The CVSS score of 6.5 indicates a medium severity level primarily due to its high impact on availability. This score reflects the ease of exploitation and the potential consequences of a successful attack.
Technical Analysis
The root cause of this vulnerability lies in the MySQL Server's optimizer component. Attackers may exploit this vulnerability over a network, with low privileges required to initiate the attack. The complexity of executing such an attack is low, and no user interaction is needed, making it accessible for exploitation.
From a technical perspective, if successful, the vulnerability impacts the availability of the MySQL Server, leading to potential service interruptions. This vulnerability does not affect confidentiality or integrity, focusing solely on availability.
Risk & Impact Analysis
The real-world risk posed by CVE-2026-21949 is significant, particularly for organizations that rely on MySQL Server for critical operations. The potential for denial of service can disrupt business processes, leading to financial losses and reputational damage. Given its classification as a medium severity vulnerability, organizations must assess their exposure and implement remediation strategies promptly.
Organizations should evaluate their patch management processes to ensure timely updates. The vulnerability's high impact on availability necessitates immediate attention to minimize the blast radius and mitigate potential service disruptions.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
This vulnerability affects all versions of MySQL Server from 9.0.0 to 9.5.0. Organizations using these versions are strongly advised to update their systems to the latest patched version to mitigate risks associated with this vulnerability.
Mitigation & Remediation
Organizations should prioritize applying the latest patches provided by Oracle to address this vulnerability. For those unable to immediately patch, implementing network controls to restrict access to the MySQL Server can serve as a temporary workaround.
For ongoing protection, organizations may consider engaging in continuous penetration testing to identify and remediate vulnerabilities proactively.
Detection Guidance
Monitoring logs for unusual MySQL Server behavior or unexpected service interruptions can serve as early indicators of this vulnerability being exploited. Organizations should also track network traffic patterns for unauthorized access attempts.
AppSecure Threat Intelligence Insight
CVE-2026-21949 exemplifies the ongoing challenges faced by organizations in maintaining robust database security. This vulnerability highlights the importance of regular updates and vulnerability management practices. Security teams should learn from such incidents to enhance their defensive strategies.
Organizations can benefit from developing a comprehensive vulnerability management program to systematically address such vulnerabilities and reduce exposure to potential threats.
Additionally, engaging in penetration testing can further help identify vulnerabilities before they can be exploited.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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