Denial of Service Vulnerability in Oracle MySQL Server's JSON Component
CVE-2026-34308

6.5MEDIUM

Key Information:

Vendor

Oracle
Status
Mysql Server
Vendor
CVE Published:
21 April 2026

What is CVE-2026-34308?

A vulnerability in the MySQL Server from Oracle affects the JSON component, allowing low-privileged attackers with network access to potentially cause a denial of service. Successful exploitation can lead to a hang or a repeatable crash of the MySQL Server, significantly impacting availability. The affected versions include 8.0.0 to 8.0.45, 8.4.0 to 8.4.8, and 9.0.0 to 9.6.0. Users are advised to apply patches as outlined in the vendor's advisory to mitigate risks.

Affected Version(s)

MySQL Server 8.0.0 <= 8.0.45

MySQL Server 8.4.0 <= 8.4.8

MySQL Server 9.0.0 <= 9.6.0

References

https://www.oracle.com/security-alerts/cpuapr2026.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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