What is CVE-2026-21968?

CVE-2026-21968 is a medium-severity vulnerability in Oracle MySQL Server. CVSS score: 6.5/10. Published 2026-01-20.

How severe is CVE-2026-21968?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Oracle MySQL Server

CVE-2026-21968

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.0-8.0.44, 8.4.0-8.4.7 and 9.0.0-9.5.0. Easily exploitable vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.1 Base Score 6.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

EPSS: 0.003 (17.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Oracle Mysql_server
Oracle Corporation Mysql Server — versions 8.0.0, 8.4.0, 9.0.0

References

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

Frequently asked questions

What is CVE-2026-21968?: CVE-2026-21968 is a medium-severity vulnerability in Oracle MySQL Server. CVSS score: 6.5/10. Published 2026-01-20.
How severe is CVE-2026-21968?: Medium severity. CVSS v3 base score is 6.5 out of 10.