CVE-2026-22009: Medium severity Oracle MySQL Server vulnerability
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.0-8.0.45, 8.4.0-8.4.8 and 9.0.0-9.6.0. Easily exploitable vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. 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).
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Configuration
If the server does not require remote connections, configure MySQL to only listen on localhost (e.g., set bind-address to 127.0.0.1) or otherwise disable remote networking for the MySQL instance to prevent network access.
MySQL Server network_listen (bind-address/remote connections) = listen only on localhost / disable remote networking - Compensating control
Restrict network access to the MySQL service using firewall rules, ACLs, or network segmentation. Limit access to trusted management IPs, block unnecessary protocols and ports, and isolate database servers from untrusted networks to mitigate remote exploitation that could cause a DoS.
Event History
Frequently Asked Questions
What is the severity of CVE-2026-22009?
CVE-2026-22009 is classified as an easily exploitable vulnerability that can be exploited by low privileged attackers.
How do I fix CVE-2026-22009?
To fix CVE-2026-22009, users should update their MySQL Server installations to the latest version beyond the affected releases.
Which versions of MySQL Server are affected by CVE-2026-22009?
CVE-2026-22009 affects MySQL Server versions 8.0.0 to 8.0.45, 8.4.0 to 8.4.8, and 9.0.0 to 9.6.0.
Can CVE-2026-22009 be exploited remotely?
Yes, CVE-2026-22009 can be exploited remotely by low privileged attackers with network access via multiple protocols.
What component of MySQL Server is affected by CVE-2026-22009?
CVE-2026-22009 affects the Optimizer component of the MySQL Server product.