Denial of Service Vulnerability in MySQL Server by Oracle
CVE-2026-21948

4.9MEDIUM

Key Information:

Vendor

Oracle
Status
Mysql Server
Vendor
CVE Published:
20 January 2026

What is CVE-2026-21948?

A vulnerability exists in the MySQL Server component of Oracle MySQL, affecting versions 8.0.0 through 8.0.44, 8.4.0 through 8.4.7, and 9.0.0 through 9.5.0. This weakness can be exploited by attackers with high privileges and network access, leading to potential disruptions. When successfully exploited, it may result in the server hanging or experiencing a repeatable crash, causing a denial of service. Users and administrators are urged to apply the latest patches to mitigate this risk.

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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

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