MySQL Server Vulnerability in Oracle MySQL Affects Multiple Versions
CVE-2026-21998

4.9MEDIUM

Key Information:

Vendor

Oracle
Status
Mysql Server
Vendor
CVE Published:
21 April 2026

What is CVE-2026-21998?

A vulnerability exists in Oracle's MySQL Server product that allows an attacker with high privileges and network access to exploit the Optimizer component. This issue can lead to unauthorized actions, including the ability to cause sustained service interruptions or crashes of the MySQL Server, potentially making it unavailable for legitimate users. The vulnerability affects several versions, making it essential for users to apply necessary updates and patches to safeguard their systems.

Affected Version(s)

MySQL Server 8.0.0 <= 8.0.45

MySQL Server 8.4.0 <= 8.4.8

MySQL Server 9.0.0 <= 9.6.0

References

https://www.oracle.com/security-alerts/cpuapr2026.html
vendor-advisory

CVSS V3.1

Score:
4.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.