What is CVE-2026-34278?

CVE-2026-34278 is a medium-severity vulnerability in Oracle Mysql_server, classified under Uncontrolled Resource Consumption. 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.

Resource exhaustion in Oracle 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…

Vulnerability class: DoS (Denial of Service)

EPSS: 0.003 (24.4th 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 Mysql_server
Oracle Corporation Mysql Server — versions 8.0.0

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

secalert_us@oracle.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-34278?: CVE-2026-34278 is a medium-severity vulnerability in Oracle Mysql_server, classified under Uncontrolled Resource Consumption. 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.