CVE-2026-21998

Published: Apr 21, 2026 Last Modified: Apr 23, 2026
ExploitDB:
Other exploit source:
Google Dorks:
MEDIUM 4,9
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: high
User Interaction: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: high

Description

AI Translation Available

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.0-8.0.45, 8.4.0-8.4.8 and 9.0.0-9.6.0. 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).

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,0004
Percentile
0,1th
Updated

EPSS Score Trend (Last 4 Days)

400

Uncontrolled Resource Consumption

Draft
Abstraction: Class Structure: Simple
Common Consequences
Security Scopes Affected:
Availability Access Control Other
Potential Impacts:
Dos: Crash, Exit, Or Restart Dos: Resource Consumption (Cpu) Dos: Resource Consumption (Memory) Dos: Resource Consumption (Other) Bypass Protection Mechanism Other
Applicable Platforms
Technologies: AI/ML, Not Technology-Specific
Likelihood of Exploit: High
View CWE Details
Application

Mysql Server by Oracle

Product Information
Vendor Oracle
Product Mysql Server
Version Range Affected
From 9.0.0 (inclusive)
To 9.6.0 (inclusive)
cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Mysql Server by Oracle

Product Information
Vendor Oracle
Product Mysql Server
Version Range Affected
From 8.4.0 (inclusive)
To 8.4.8 (inclusive)
cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Mysql Server by Oracle

Product Information
Vendor Oracle
Product Mysql Server
Version Range Affected
From 8.0.0 (inclusive)
To 8.0.45 (inclusive)
cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
https://www.oracle.com/security-alerts/cpuapr2026.html
https://www.oracle.com/security-alerts/cpuapr2026.html