CVE-2026-101919

Hypershift: hypershift: unsanitized kubeconfig passthrough from tenant namespace to control plane

Published Oct 5, 2026 CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Description
A flaw was found in the HyperShift operator. The operator copies user-provided Kubernetes configuration (kubeconfig) secrets directly into the privileged control plane namespace without proper validation or sanitization. An authenticated user with cluster and secret creation permissions can exploit this vulnerability by supplying a configuration containing unauthorized executable plugins. When downstream controllers consume this configuration, an attacker can achieve arbitrary code execution within the control plane.

Remediation

Vendor Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Redhat multicluster Engine For Kubernetes
Vendors & Products Redhat multicluster Engine For Kubernetes
Type Values Removed Values Added
Description A flaw was found in the HyperShift operator. The operator copies user-provided Kubernetes configuration (kubeconfig) secrets directly into the privileged control plane namespace without proper validation or sanitization. An authenticated user with cluster and secret creation permissions can exploit this vulnerability by supplying a configuration containing unauthorized executable plugins. When downstream controllers consume this configuration, an attacker can achieve arbitrary code execution within the control plane.
Title Hypershift: hypershift: unsanitized kubeconfig passthrough from tenant namespace to control plane
First Time appeared Redhat
Redhat multicluster Engine
Weaknesses CWE-20
CPEs cpe:/a:redhat:multicluster_engine
Vendors & Products Redhat
Redhat multicluster Engine
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Oct 7, 2026, 8:16 PM
Reserved
Sep 28, 2026, 3:59 PM
Status
Awaiting Analysis
Published
Oct 5, 2026, 6:17 PM
Modified
Oct 7, 2026, 9:17 PM
Severity
Important
Public date
Sep 28, 2026, 12:00 AM