MySQL Server Vulnerability in Oracle MySQL Product
CVE-2026-21964

4.9MEDIUM

Key Information:

Vendor

Oracle
Status
Mysql Server
Vendor
CVE Published:
20 January 2026

What is CVE-2026-21964?

A vulnerability exists in the MySQL Server component of Oracle MySQL, specifically in the Thread Pooling functionality. This vulnerability can be easily exploited by a high-privileged attacker who has network access via various protocols. If successfully attacked, the MySQL Server can be subjected to unauthorized hangs or repeated crashes, leading to a Denial of Service (DoS) condition. Affected versions include MySQL Server 8.0.0 through 8.0.44, 8.4.0 through 8.4.7, and 9.0.0 through 9.5.0, making it critical for administrators to address this issue promptly to maintain server uptime and security.

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

.