# 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.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 15 Apr 2026
- **Updated:** 15 Apr 2026
- **Also known as:** AZL-86025, GHSA-j6cv-3w8p-vrg8, GO-2026-5450, MINI-m39g-7cfg-vjj2, MINI-vm2m-q958-x3pv

## 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 (Incorrect Authorization)

## Which versions are affected by CVE-2026-6383?

3 open source packages ship an affected version, including kubevirt.io/kubevirt.


| Package | Ecosystem | 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.

## Is CVE-2026-6383 being exploited?

There is no known exploitation of CVE-2026-6383 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-6383 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-6383 in the wild and no public exploit code.

Affected packages and fixed versions:
- kubevirt.io/kubevirt (Go): affected all versions; no fix listed
- kubevirt.io/kubevirt (Go): affected all versions up to 1.8.1; no fix listed
- kubevirt.io/kubevirt (Go): affected all versions up to 1.8.1; no fix listed

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-6383/ (Markdown: https://insights.sbomify.com/CVE-2026-6383/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-6383
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-6383
- OSV: https://osv.dev/vulnerability/CVE-2026-6383

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-6383/
Summaries are generated and may contain mistakes; the official description above is the record.