CVE-2026-6383: Kubevirt.io/kubevirt Remote Code Execution Vulnerability

MODERATE
Advisory Identifier: GHSA-j6cv-3w8p-vrg8
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CVSS 5.4
CWE-863
Published
Advisory Summary

CVE-2026-6383 is a MODERATE (CVSS 5.4) remote code execution vulnerability (CWE-863: Incorrect Authorization) affecting Kubevirt.io/kubevirt libraries in the Go ecosystem. The issue involves kubevirt's authorization mechanism improperly truncates subresource names. Remediation is available in the latest vendor maintenance releases.

CVE-2026-6383 at a Glance

CVE Identifier CVE-2026-6383
GHSA Identifier GHSA-j6cv-3w8p-vrg8
Severity MODERATE
CVSS v3.1 Base Score 5.4
CWE Classification CWE-863: Incorrect Authorization
Affected Product Kubevirt.io/kubevirt
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 5.4

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-6383

To remediate this vulnerability, upgrade all affected Kubevirt.io/kubevirt dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

kubevirt.io/kubevirt fixed: Latest secure release 
Upgrade kubevirt.io/kubevirt to Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for kubevirt.io/kubevirt

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-6383, inspect your project dependencies for Kubevirt.io/kubevirt:

inspect dependencies for kubevirt.io/kubevirt

Analyze the terminal output to locate any version of Kubevirt.io/kubevirt in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-863: Incorrect Authorization, where the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. In Kubevirt.io/kubevirt, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2026-6383 Affected Kubevirt.io/kubevirt Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
kubevirt.io/kubevirt
golang/kubevirt.io/kubevirt
Go
≤ 1.8.1

References

NVD — CVE-2026-6383 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-6383
Kubevirt.io/kubevirt Source Repository REPOSITORY
https://github.com/kubevirt/kubevirt/issues/17337
Kubevirt.io/kubevirt Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2026-6383
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2458741
Kubevirt.io/kubevirt Source Repository REPOSITORY
https://github.com/kubevirt/kubevirt

Frequently Asked Questions

What is CVE-2026-6383?
CVE-2026-6383 is a security vulnerability in Kubevirt.io/kubevirt involving KubeVirt's authorization mechanism improperly truncates subresource names under CWE-863: Incorrect Authorization.
Which Kubevirt.io/kubevirt versions are affected?
Affected versions include releases prior to current release patches across affected packages: kubevirt.io/kubevirt.
What version fixes CVE-2026-6383?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is kubevirt.io/kubevirt affected?
Yes, kubevirt.io/kubevirt is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-6383?
CVE-2026-6383 has a CVSS v3.1 base score of 5.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2026-6383?
CVE-2026-6383 is classified under CWE-863: Incorrect Authorization (The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.).
How can I check Go dependencies for CVE-2026-6383?
Run the dependency tree command: 'inspect dependencies for kubevirt.io/kubevirt'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-j6cv-3w8p-vrg8",
  "modified" : "2026-04-16T21:40:08Z",
  "published" : "2026-04-15T21:30:18Z",
  "aliases" : [ "CVE-2026-6383" ],
  "summary" : "KubeVirt's authorization mechanism improperly truncates subresource names",
  "details" : "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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "kubevirt.io/kubevirt"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.8.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-6383"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kubevirt/kubevirt/issues/17337"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/security/cve/CVE-2026-6383"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2458741"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/kubevirt/kubevirt"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-863" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-16T21:40:08Z",
    "nvd_published_at" : "2026-04-15T19:16:38Z"
  }
}