CVE-2026-21949
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2026-01-20

Last updated on: 2026-01-29

Assigner: Oracle

Description
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 9.0.0-9.5.0. 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).
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Meta Information
Published
2026-01-20
Last Modified
2026-01-29
Generated
2026-05-27
AI Q&A
2026-01-21
EPSS Evaluated
2026-05-26
NVD
CVE-2026-21949
EUVD
EUVD-2026-3560
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
oracle mysql_server From 9.0.0 (inc) to 9.5.0 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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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 can this vulnerability impact me? :

The impact of this vulnerability is that an attacker can cause a denial of service by making the MySQL Server hang or crash repeatedly. This disrupts availability of the database service but does not affect confidentiality or integrity.


Can you explain this vulnerability to me?

This vulnerability exists in the MySQL Server product, specifically in the Server Optimizer component. It allows a low privileged attacker with network access through multiple protocols to exploit the server. The exploitation can cause the MySQL Server to hang or crash repeatedly, resulting in a denial of service (DoS).


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