CVE-2026-6383 Kubevirt: kubevirt: unauthorized subresource access due to improper rbac evaluation
Authenticated users can bypass RBAC restrictions to access unauthorized subresources, potentially disclosing sensitive information or performing prohibited actions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-6383?
CVE-2026-6383 is a medium-severity missing authorization vulnerability in Red Hat OpenShift Virtualization 4, published on 15 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A flaw was found in KubeVirt's Role-Based Access Control (RBAC) evaluation logic. The authorization mechanism improperly truncates subresource names, leading to incorrect permission evaluations. This allows authenticated users with specific custom roles to gain unauthorized access to subresources, potentially disclosing sensitive information or performing actions they are not permitted to do. Additionally, legitimate users may be denied access to resources.
Weakness: CWE-863
Which versions are affected by CVE-2026-6383?
3 open source packages ship an affected version, including kubevirt.io/kubevirt.
| Package | Affected | Fixed in |
|---|---|---|
kubevirt.io/kubevirt Go | All versions | None |
kubevirt.io/kubevirt Go | All versions to 1.8.1 | None |
kubevirt.io/kubevirt Go | All versions to 1.8.1 | None |
How do I fix CVE-2026-6383?
Apply the vendor's patch.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-6383 being exploited?
There is no known exploitation of CVE-2026-6383 in the wild and no public exploit code.
Sources
Also known as AZL-86025, GHSA-j6cv-3w8p-vrg8, GO-2026-5450, MINI-m39g-7cfg-vjj2, MINI-vm2m-q958-x3pv.