Vulnerability in MySQL Server by Oracle Affecting Optimizer Component
CVE-2026-34278

4.9MEDIUM

Key Information:

Vendor

Oracle
Status
Mysql Server
Vendor
CVE Published:
21 April 2026

What is CVE-2026-34278?

A vulnerability exists in the Optimizer component of MySQL Server 8.0.0 to 8.0.45 by Oracle, allowing a malicious actor with high privileges and network access to exploit the server through multiple protocols. This could lead to unauthorized interruptions or a complete denial of service, potentially causing the server to hang or crash repeatedly. Organizations using affected MySQL versions are urged to apply the latest patches to mitigate risks and ensure operational stability.

Affected Version(s)

MySQL Server 8.0.0 <= 8.0.45

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

.