CVE-2026-34303
Denial of Service in Oracle MySQL Server Optimizer Component
Publication date: 2026-04-21
Last updated on: 2026-04-23
Assigner: Oracle
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| oracle | mysql_server | From 8.0.0 (inc) to 8.0.45 (inc) |
| oracle | mysql_server | From 8.4.0 (inc) to 8.4.8 (inc) |
| oracle | mysql_server | From 9.0.0 (inc) to 9.6.0 (inc) |
Helpful Resources
Exploitability
| 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)?:
The vulnerability allows a low privileged attacker to cause a denial of service (DoS) by hanging or crashing the MySQL Server, impacting availability.
However, there is no information provided about impacts on confidentiality or integrity, which are typically critical for compliance with standards like GDPR or HIPAA.
Therefore, based on the available information, it is unclear how this vulnerability directly affects compliance with common standards and regulations.
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 8.0.0 through 8.0.45, 8.4.0 through 8.4.8, and 9.0.0 through 9.6.0.
The vulnerability is easily exploitable by a low privileged attacker who has network access through multiple protocols. Exploiting this vulnerability allows the attacker to cause the MySQL Server to hang or crash repeatedly, 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 frequently, leading to a complete denial of service.
This means that legitimate users and applications relying on the MySQL Server may experience interruptions, downtime, or inability to access database services.