Auth bypass in Openshift-Metal3 Fakefish

CVE-2026-71566

FakeFish handles incoming credentials by passing them down to scripts. This works for real hardware because in the end it's up to the BMC to validate them. However, KubeVirt relies on a KUBECONFIG file mounted to the container and completely ignores the credentials. This allows any user of the cluster to control VMs of the user that created fakefish, power them on and off, and mount arbitrary CD images to them.

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-71566?
CVE-2026-71566 is a critical-severity vulnerability in Openshift-Metal3 Fakefish, classified under Missing Authentication for Critical Function. CVSS score: 9.3/10. Published 2026-08-17.
How severe is CVE-2026-71566?
Critical severity. CVSS v3 base score is 9.3 out of 10.