MySQL Server Vulnerability in Oracle MySQL Server: Optimizer Component
CVE-2026-21949

6.5MEDIUM

Key Information:

Vendor

Oracle
Status
Mysql Server
Vendor
CVE Published:
20 January 2026

What is CVE-2026-21949?

A vulnerability exists in the Oracle MySQL Server's Optimizer component that can be exploited by low-privileged attackers with network access through multiple protocols. This vulnerability allows for the potential to cause MySQL Server to hang or frequently crash, resulting in a Denial of Service (DoS). It affects specific versions from 9.0.0 to 9.5.0, making it critical for organizations using these versions to implement necessary security measures to mitigate risks.

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Affected Version(s)

MySQL Server 9.0.0 <= 9.5.0

References

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

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