How severe is CVE-2026-34278?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Vulnerability in Oracle Corporation Mysql Server

CVE-2026-34278

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.0-8.0.45. Easily exploitable vulnerability allows high privileged attacker with network access via mult…

EPSS: 0.000 (14.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.

Affected products

Oracle Corporation Mysql Server — versions 8.0.0

References

Oracle Advisory (vendor-advisory)

Frequently asked questions

What is CVE-2026-34278?: CVE-2026-34278 is a medium-severity vulnerability in Oracle Corporation Mysql Server. CVSS score: 4.9/10. Published 2026-04-21.
How severe is CVE-2026-34278?: Medium severity. CVSS v3 base score is 4.9 out of 10.