KubeVirt is a virtual machine management add-on for Kubernetes. Versions 1.5.3 and below, and 1.6.0 contained a flawed implementation of the Kubernetes aggregation layer's authentication flow which could enable bypass of RBAC controls. It was discovered that the virt-api component fails to correctly authenticate the client when receiving API requests over mTLS. In particular, it fails to validate the CN (Common Name) field in the received client TLS certificates against the set of allowed values defined in the extension-apiserver-authentication configmap. Failre to validate certain fields in the client TLS certificate may allow an attacker to bypass existing RBAC controls by directly communicating with the aggregated API server, impersonating the Kubernetes API server and its aggregator component. This issue is fixed in versions 1.5.3 and 1.6.1.
Metrics
Affected Vendors & Products
Advisories
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Github GHSA |
GHSA-38jw-g2qx-4286 | KubeVirt Affected by an Authentication Bypass in Kubernetes Aggregation Layer |
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Fri, 07 Nov 2025 19:15:00 +0000
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| Metrics |
ssvc
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Fri, 07 Nov 2025 18:45:00 +0000
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| Description | KubeVirt is a virtual machine management add-on for Kubernetes. Versions 1.5.3 and below, and 1.6.0 contained a flawed implementation of the Kubernetes aggregation layer's authentication flow which could enable bypass of RBAC controls. It was discovered that the virt-api component fails to correctly authenticate the client when receiving API requests over mTLS. In particular, it fails to validate the CN (Common Name) field in the received client TLS certificates against the set of allowed values defined in the extension-apiserver-authentication configmap. Failre to validate certain fields in the client TLS certificate may allow an attacker to bypass existing RBAC controls by directly communicating with the aggregated API server, impersonating the Kubernetes API server and its aggregator component. This issue is fixed in versions 1.5.3 and 1.6.1. | |
| Title | KubeVirt Affected by an Authentication Bypass in Kubernetes Aggregation Layer | |
| Weaknesses | CWE-287 CWE-295 |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2025-11-07T18:54:46.779Z
Reserved: 2025-11-03T22:12:51.365Z
Link: CVE-2025-64432
Updated: 2025-11-07T18:54:25.963Z
Status : Received
Published: 2025-11-07T19:16:26.833
Modified: 2025-11-07T19:16:26.833
Link: CVE-2025-64432
No data.
OpenCVE Enrichment
No data.
Github GHSA