CVE-2025-55205
Capsule tenant owners with "patch namespace" permission can hijack system namespaces label
CRITICAL 9.0EPSS 0.5%
Capsule is a multi-tenancy and policy-based framework for Kubernetes. A namespace label injection vulnerability in Capsule v0.10.3 and earlier allows authenticated tenant users to inject arbitrary labels into system namespaces (kube-system, default, capsule-system), bypassing multi-tenant isolation and potentially accessing cross-tenant resources through TenantResource selectors. This vulnerability enables privilege escalation and violates the fundamental security boundaries that Capsule is designed to enforce. This vulnerability is fixed in 0.10.4.
- Affected
- projectcapsule · capsule
- CVSS v3.1 GITHUB
- 9.0 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H - EPSS
- 0.46% chance of exploitation in the next 30 days, 38th percentile
- Published
- 2025-08-18