CVE Watch22 jul 2026

CVE-2026-30963

Capsule is a multi-tenancy and policy-based framework for Kubernetes. To defend against namespace hijacking achieved through update/patch op

CVSS

3.9

Bajo

EPSS

0.2%

p10

KEV

—

Exploit Today

0-100

Publicado: 1 jun 2026 · Última mod.: 22 jul 2026 · CWE-20

EPSS · 30d

0.2%EPSS · 30 días0.2%

2026-07-152026-08-12

Descripción técnica

Capsule is a multi-tenancy and policy-based framework for Kubernetes. To defend against namespace hijacking achieved through update/patch operations on namespaces, Capsule uses a webhook to validate update requests targeting namespaces. However, in Kubernetes, the namespace/finalize and namespace/status subresource APIs can also modify various fields of a namespace, including the metadata field. Prior to version 0.13.0, the webhook does not define interception rules for these subresources. As a result, if a tenant administrator has permission to modify namespace/status or namespace/finalize, they can successfully perform namespace hijacking. Version 0.13.0 fixes the issue. Another mitigation is to add two subresources (namespaces and snamespaces/status with namespace/finalize within it) to the resources list in the ValidatingWebhookConfiguration rules.

Referencias oficiales

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