CVE-2026-21964
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: Thread Pooling). Supported versions that are affected are 8.0.0-8.0.44, 8.4.0-8.4.7 and 9.0.0-9.5.0. 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
2026-01-20
Last Modified
2026-01-29
Generated
2026-06-16
AI Q&A
2026-01-21
EPSS Evaluated
2026-06-15
NVD
CVE-2026-21964
EUVD
EUVD-2026-3548
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
oracle mysql From 8.0.0 (inc) to 8.0.44 (inc)
oracle mysql From 8.4.0 (inc) to 8.4.7 (inc)
oracle mysql 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-NVD-CWE-noinfo
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Executive Summary

This vulnerability exists in the Thread Pooling component of Oracle MySQL Server versions 8.0.0-8.0.44, 8.4.0-8.4.7, and 9.0.0-9.5.0. It allows a high privileged attacker with network access via multiple protocols to exploit the server easily. Successful exploitation can cause the MySQL Server to hang or crash repeatedly, resulting in a denial of service (DoS) condition.

Impact Analysis

The impact of this vulnerability is a denial of service (DoS) attack on the MySQL Server. An attacker with high privileges and network access can cause the server to hang or crash frequently, disrupting availability and potentially causing downtime for applications relying on the database.

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