CVE-2026-34303: 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.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 8.0.46-1
Event History
Frequently Asked Questions
What is the severity of CVE-2026-34303?
CVE-2026-34303 has been classified as an easily exploitable vulnerability with a high level of severity.
What versions of MySQL Server are affected by CVE-2026-34303?
CVE-2026-34303 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.
How do I fix CVE-2026-34303?
To fix CVE-2026-34303, upgrade your MySQL Server to a version that is not affected by this vulnerability.
Can CVE-2026-34303 be exploited remotely?
Yes, CVE-2026-34303 can be exploited by low privileged attackers with network access via multiple protocols.
What component of MySQL Server does CVE-2026-34303 affect?
CVE-2026-34303 affects the optimizer component of the MySQL Server product.