CVE-2026-21949: Medium severity Oracle MySQL Server vulnerability
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 9.0.0-9.5.0. 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
Event History
Frequently Asked Questions
What is the severity of CVE-2026-21949?
CVE-2026-21949 is considered an easily exploitable vulnerability that poses a significant risk to affected MySQL Server versions.
How do I fix CVE-2026-21949?
To fix CVE-2026-21949, upgrade your MySQL Server to a version later than 9.5.0.
Which versions of MySQL Server are affected by CVE-2026-21949?
CVE-2026-21949 affects MySQL Server versions between 9.0.0 and 9.5.0 inclusive.
Can a low privileged attacker exploit CVE-2026-21949?
Yes, a low privileged attacker can exploit CVE-2026-21949 with network access through multiple protocols.
What component of MySQL Server is impacted by CVE-2026-21949?
CVE-2026-21949 impacts the Optimizer component of MySQL Server.