Vulnerability · Published Aug 17, 2026 · Assigned by redhat-cnalr

CVE-2026-71566KubeVirt backend is not authenticated

Critical 9.3

In plain English

A critical-severity missing authentication in fakefish from openshift-metal3. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities).

Severity (CVSS 3.1)9.3Critical

Exploit odds (30 days)0.4%top 68.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
openshift-metal3	fakefish	0 – through 28f9a6b

Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H

References

https://github.com/openshift-metal3/fakefish/security/advisories/GHSA-qpfr-jqjq-v83w vendor-advisory