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).

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-01-20

Last Modified

2026-01-29

Generated

2026-07-06

AI Q&A

2026-01-21

EPSS Evaluated

2026-07-05

NVD

CVE-2026-21949

EUVD

EUVD-2026-3560

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	mysql_server	From 9.0.0 (inc) to 9.5.0 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-400	The product does not properly control the allocation and maintenance of a limited resource.

Attack-Flow Graph

Executive Summary

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).

Impact Analysis

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.

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