CVE-2026-21950
Unknown Unknown - Not Provided
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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
2026-06-16
AI Q&A
2026-01-21
EPSS Evaluated
2026-06-15
NVD
CVE-2026-21950
EUVD
EUVD-2026-3559
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.
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Executive Summary

This vulnerability exists in the MySQL Server product of Oracle MySQL, specifically in the Server Optimizer component. It affects versions 9.0.0 through 9.5.0. A low privileged attacker with network access via multiple protocols can exploit this vulnerability to cause the MySQL Server to hang or crash repeatedly, resulting in a denial of service (DoS).

Impact Analysis

The vulnerability can allow an attacker to cause a denial of service by making the MySQL Server hang or crash repeatedly. This disrupts availability of the database service, potentially impacting applications and users relying on the MySQL Server.

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