CVE-2026-34278: 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. 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
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-2026-34278?
CVE-2026-34278 is considered to be an easily exploitable vulnerability that allows high privileged attackers to compromise MySQL Server.
How do I fix CVE-2026-34278?
To fix CVE-2026-34278, you should upgrade your MySQL Server installation to a version later than 8.0.45.
Who is affected by CVE-2026-34278?
CVE-2026-34278 affects supported versions of Oracle MySQL Server ranging from 8.0.0 to 8.0.45.
What components are involved in CVE-2026-34278?
CVE-2026-34278 involves a vulnerability in the MySQL Server component, specifically within the Optimizer.
What are the potential impacts of exploiting CVE-2026-34278?
Exploiting CVE-2026-34278 can allow attackers with network access to compromise the integrity and availability of the MySQL Server.