Denial of Service Vulnerability in MySQL Server by Oracle
CVE-2026-21941

4.9MEDIUM

Key Information:

Vendor

Oracle
Status
Mysql Server
Vendor
CVE Published:
20 January 2026

What is CVE-2026-21941?

A serious vulnerability has been identified in Oracle's MySQL Server, impacting supported versions 8.0.0 through 8.0.44, 8.4.0 through 8.4.7, and 9.0.0 through 9.5.0. This flaw allows an attacker with high privileges and network access to exploit MySQL Server through multiple protocols. Successful exploitation can lead to a denial of service, causing the MySQL Server to hang or crash repeatedly, thus compromising the availability of the database. It is crucial for organizations using affected versions to apply necessary security measures to mitigate potential risks.

Affected Version(s)

MySQL Server 8.0.0 <= 8.0.44

MySQL Server 8.4.0 <= 8.4.7

MySQL Server 9.0.0 <= 9.5.0

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

.