CVE-2026-101919: Improper Input Validation in Red Hat Multicluster Engine for Kubernetes
Description
CVE-2026-101919 is a high-severity vulnerability in Red Hat Multicluster Engine for Kubernetes. It involves improper input validation in the HyperShift operator, which copies user-supplied kubeconfig secrets into a privileged namespace without sanitization. An authenticated user with cluster and secret creation permissions can exploit this by providing a configuration with unauthorized executable plugins, potentially leading to arbitrary code execution in the control plane.
CVSS v3.1
Score 8.8high
Affected software
Red Hat
Multicluster Engine for Kubernetes
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability exists in the HyperShift operator of Red Hat Multicluster Engine for Kubernetes. The operator improperly validates and sanitizes user-provided Kubernetes configuration secrets before copying them into the privileged control plane namespace. This flaw allows an authenticated user who can create clusters and secrets to supply a kubeconfig containing unauthorized executable plugins. When downstream controllers use this configuration, it can result in arbitrary code execution within the control plane environment.
Potential Impact
Successful exploitation allows an authenticated user with cluster and secret creation permissions to execute arbitrary code in the privileged control plane namespace. This compromises the integrity, confidentiality, and availability of the Kubernetes control plane, potentially leading to full control over cluster operations.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-101919 for current remediation guidance. Until an official fix is available, restrict cluster and secret creation permissions to trusted users only and monitor for suspicious configurations involving executable plugins.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-09-28T15:59:56.062Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-101919","vendor":"Red Hat"}]
Threat ID: 6ac3e69d2cdf04f65628b48a
Added to database: 10/05/2026, 18:04:13 UTC
Last enriched: 10/05/2026, 18:18:26 UTC
Last updated: 10/05/2026, 20:48:07 UTC
Views: 5
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