Denial of Service Vulnerability in MySQL Server by Oracle
CVE-2026-34270

6.5MEDIUM

Key Information:

Vendor

Oracle
Status
Mysql Server
Vendor
CVE Published:
21 April 2026

What is CVE-2026-34270?

A vulnerability exists in the MySQL Server component of Oracle MySQL, specifically within the Group Replication Plugin. This issue affects several supported versions of MySQL Server and can be exploited by low-privileged attackers with network access. The vulnerability allows for the possibility of causing a denial of service, resulting in the MySQL Server hanging or crashing repeatedly. This can significantly disrupt database services and availability, posing a threat to operational continuity.

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:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.