CVE-2026-34278
Received Received - Intake
Denial of Service in Oracle MySQL Server Optimizer

Publication date: 2026-04-21

Last updated on: 2026-04-23

Assigner: Oracle

Description
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).
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Meta Information
Published
2026-04-21
Last Modified
2026-04-23
Generated
2026-05-07
AI Q&A
2026-04-22
EPSS Evaluated
2026-05-05
NVD
CVE-2026-34278
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
oracle mysql_server From 8.0.0 (inc) to 8.0.45 (inc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.
Attack-Flow Graph
AI Powered Q&A
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:

This vulnerability allows a high privileged attacker to cause a denial of service (DoS) by hanging or crashing the MySQL Server, impacting availability.

However, there is no indication from the provided information that this vulnerability leads to unauthorized disclosure, modification, or loss of data.

Therefore, while availability impacts could affect operational continuity, there is no direct evidence that this vulnerability compromises data confidentiality or integrity, which are critical for compliance with standards like GDPR or HIPAA.

Organizations relying on MySQL Server should consider the availability impact in their risk assessments but the provided data does not specify direct compliance violations.


Can you explain this vulnerability to me?

This vulnerability exists in the MySQL Server product of Oracle MySQL, specifically in the Server Optimizer component. It affects supported versions from 8.0.0 to 8.0.45. The vulnerability is easily exploitable by a high privileged attacker who has network access through multiple protocols.

An attacker exploiting this vulnerability can cause the MySQL Server to hang or repeatedly crash, resulting in a complete denial of service (DoS).


How can this vulnerability impact me? :

The primary impact of this vulnerability is on the availability of the MySQL Server. A successful attack can cause the server to hang or crash repeatedly, leading to a complete denial of service.

This means that legitimate users and applications relying on the MySQL Server may experience service interruptions or outages.


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