Denial of Service Vulnerability in MySQL Server by Oracle
CVE-2026-34271

6.5MEDIUM

Key Information:

Vendor

Oracle
Status
Mysql Server
Vendor
CVE Published:
21 April 2026

What is CVE-2026-34271?

A vulnerability exists in Oracle’s MySQL Server, specifically within the Group Replication Plugin. This vulnerability allows an attacker with low privilege and network access to exploit the server through various protocols. Successful exploitation might lead to a denial of service (DoS), resulting in frequent crashes or hangs of the MySQL Server, thereby compromising its availability. Supported versions from 8.0.0 through 8.0.45, as well as versions 8.4.0 to 8.4.8 and 9.0.0 to 9.6.0 are affected, emphasizing the need for immediate attention and corrective action.

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

.