TI-2025-39845 Aliases CVE-2025-64432 GHSA-38jw-g2qx-4286

KubeVirt Affected by an Authentication Bypass in Kubernetes Aggregation Layer

MEDIUM 55CWE-287Published 2025-11-07 · Updated 2025-11-07

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: High
Impact type: Security bypass, Spoofing
Confidentiality · integrity · availability: None · None · High
Fix status: Partial Red Hat: 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-287 and CWE-295.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00146 3rd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Partial kubevirt (kubevirt): 1.5.3, 1.6.1kubevirt.io/kubevirt (Go): 1.5.3, 1.6.1, 1.7.0-rc.0Red Hat: 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
kubevirt	kubevirt	before 1.5.3; 1.6.0 to before 1.6.1	1.5.3, 1.6.1	Patch available	CNA
—	kubevirt.io/kubevirt (Go)	before 1.5.3	1.5.3	Patch available	GHSA-38jw-g2qx-4286
—	kubevirt.io/kubevirt (Go)	1.6.0-alpha.0 to before 1.6.1	1.6.1	Patch available	GHSA-38jw-g2qx-4286
—	kubevirt.io/kubevirt (Go)	1.7.0-alpha.0 to before 1.7.0-rc.0	1.7.0-rc.0	Patch available	GHSA-38jw-g2qx-4286

kubevirt Vendorkubevirt Affected before 1.5.3; 1.6.0 to before 1.6.1 Fixed in 1.5.3, 1.6.1 Patch available CNA
kubevirt.io/kubevirt (Go) Vendor— Affected before 1.5.3 Fixed in 1.5.3 Patch available GHSA-38jw-g2qx-4286
kubevirt.io/kubevirt (Go) Vendor— Affected 1.6.0-alpha.0 to before 1.6.1 Fixed in 1.6.1 Patch available GHSA-38jw-g2qx-4286
kubevirt.io/kubevirt (Go) Vendor— Affected 1.7.0-alpha.0 to before 1.7.0-rc.0 Fixed in 1.7.0-rc.0 Patch available GHSA-38jw-g2qx-4286

CPE configurations NVD · 4

CPE	Versions	Role	Vendor
cpe:2.3:a:kubevirt:kubevirt::::::kubernetes::*	before 1.5.3	Vulnerable	kubevirt
cpe:2.3:a:kubevirt:kubevirt:1.6.0:-::::kubernetes::*	1.6.0	Vulnerable	kubevirt
cpe:2.3:a:kubevirt:kubevirt:1.6.0:rc0::::kubernetes::*	1.6.0 rc0	Vulnerable	kubevirt
cpe:2.3:a:kubevirt:kubevirt:1.6.0:rc1::::kubernetes::*	1.6.0 rc1	Vulnerable	kubevirt

cpe:2.3:a:kubevirt:kubevirt:*:*:*:*:*:kubernetes:*:* Versions before 1.5.3 Vulnerable ·kubevirt
cpe:2.3:a:kubevirt:kubevirt:1.6.0:-:*:*:*:kubernetes:*:* Versions 1.6.0 Vulnerable ·kubevirt
cpe:2.3:a:kubevirt:kubevirt:1.6.0:rc0:*:*:*:kubernetes:*:* Versions 1.6.0 rc0 Vulnerable ·kubevirt
cpe:2.3:a:kubevirt:kubevirt:1.6.0:rc1:*:*:*:kubernetes:*:* Versions 1.6.0 rc1 Vulnerable ·kubevirt

Remediation

Fix · CNA kubevirt (kubevirt) Fixed in 1.5.3, 1.6.1
Fix · GHSA-38jw-g2qx-4286 kubevirt.io/kubevirt (Go) Fixed in 1.5.3 Advisory →
Fix · GHSA-38jw-g2qx-4286 kubevirt.io/kubevirt (Go) Fixed in 1.6.1 Advisory →
Fix · GHSA-38jw-g2qx-4286 kubevirt.io/kubevirt (Go) Fixed in 1.7.0-rc.0 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat OpenShift Virtualization 4	Affected	No fix yet: Fix deferred
Red Hat Web Terminal	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2025-64432
2026-10-03 Alias added: GHSA-38jw-g2qx-4286

References

Exploit 1

https://github.com/kubevirt/kubevirt/security/advisories/GHSA-38jw-g2qx-4286

Patch 3

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2025-64432

Other 1

https://github.com/kubevirt/kubevirt

TI-2025-39759 KubeVirt Vulnerable to Arbitrary Host File Read and Write CVSS 4.0HIGH 8.5
TI-2022-01664 Path Traversal vulnerability in Kubevirt CVSS 3.1HIGH 8.7
TI-2025-39849 KubeVirt Excessive Role Permissions Could Enable Unauthorized VMI Migrations Between Nodes CVSS 4.0MEDIUM 6.9
TI-2025-39846 KubeVirt Arbitrary Container File Read CVSS 3.1MEDIUM 6.5
TI-2025-39847 KubeVirt Improper TLS Certificate Management Handling Allows API Identity Spoofing CVSS 3.1MEDIUM 6.3
TI-2025-39848 KubeVirt VMI Denial-of-Service (DoS) Using Pod Impersonation CVSS 3.1MEDIUM 5.3

See all 17 →

Sources

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