CVE-2026-21948: Medium severity Oracle MySQL Server vulnerability
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.0-8.0.44, 8.4.0-8.4.7 and 9.0.0-9.5.0. Easily exploitable vulnerability allows high 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 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-21948?
CVE-2026-21948 is classified as a high severity vulnerability due to its ease of exploitation and potential impact on compromised MySQL servers.
How do I fix CVE-2026-21948?
To fix CVE-2026-21948, update your MySQL Server to a version that is not affected, such as 8.0.45 or higher, 8.4.8 or higher, or 9.5.1 or higher.
What versions of MySQL Server are affected by CVE-2026-21948?
CVE-2026-21948 affects MySQL Server versions 8.0.0 to 8.0.44, 8.4.0 to 8.4.7, and 9.0.0 to 9.5.0.
Who can exploit CVE-2026-21948?
CVE-2026-21948 can be exploited by high privileged attackers with network access to the MySQL server.
What component of MySQL Server is impacted by CVE-2026-21948?
CVE-2026-21948 impacts the Optimizer component of the MySQL Server.