CVE-2026-21964: Medium severity Oracle MySQL Server vulnerability

Published Jan 20, 2026
·
Updated

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).

Affected Software

5 affected components
Oracle MySQL Server>=8.0.0<=8.0.44, >=8.4.0<=8.4.7, >=9.0.0<=9.5.0
Oracle MySQL>=8.0.0<=8.0.44
Oracle MySQL>=8.4.0<=8.4.7
Oracle MySQL>=9.0.0<=9.5.0
IBM API Connect V12 OnPrem<=All

Event History

Jan 20, 2026
CVE Published
via MITRE·09:56 PM
Data Sourced
via MITRE·09:56 PM
DescriptionSeverity
Data Sourced
via NVD·10:15 PM
DescriptionSeverityAffected Software
Data Sourced
via Red Hat·11:05 PM
DescriptionSeverityAffected Software
Jul 7, 2026
Data Sourced
via IBM·12:00 AM
DescriptionSeverityAffected Software

Parent advisories

This vulnerability appears in the following advisories.

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Frequently Asked Questions

1

What is the severity of CVE-2026-21964?

CVE-2026-21964 is considered a high-severity vulnerability due to its exploitability by high privileged attackers.

2

How do I fix CVE-2026-21964?

To fix CVE-2026-21964, upgrade your MySQL Server to a version higher than 8.0.44, 8.4.7, or 9.5.0 depending on your current version.

3

What versions of MySQL Server are affected by CVE-2026-21964?

The affected versions of MySQL Server for CVE-2026-21964 include 8.0.0-8.0.44, 8.4.0-8.4.7, and 9.0.0-9.5.0.

4

Can CVE-2026-21964 be exploited remotely?

Yes, CVE-2026-21964 can be exploited remotely by an attacker with high privileges and network access.

5

What components are involved in CVE-2026-21964?

CVE-2026-21964 involves the Server: Thread Pooling component of the Oracle MySQL product.

Company

Resources

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