Denial of Service Vulnerability in Oracle MySQL Server Product
CVE-2026-21936

4.9MEDIUM

Key Information:

Vendor

Oracle
Status
Mysql Cluster
Mysql Server
Vendor
CVE Published:
20 January 2026

What is CVE-2026-21936?

A vulnerability in Oracle MySQL Server's InnoDB component allows an attacker with high privileges and network access to exploit the system. This issue could lead to service disruptions, manifested as server hangs or repeatable crashes, ultimately resulting in a denial of service for users. The vulnerability affects several versions, making it critical for organizations using MySQL Server to review their security posture and apply necessary patches or mitigations.

Affected Version(s)

MySQL Cluster 7.6.0 <= 7.6.36

MySQL Cluster 8.0.0 <= 8.0.44

MySQL Cluster 8.4.0 <= 8.4.7

References

https://www.oracle.com/security-alerts/cpujan2026.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

.