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CVE-2025-55205— Capsule tenant owners with "patch namespace" permission can hijack system namespaces label

Quick assessment

Affected
projectcapsule capsule
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Capsule是Project Capsule开源的一个 Kubernetes 的多租户和基于策略的框架。 Capsule 0.10.3及之前版本存在安全漏洞，该漏洞源于命名空间标签注入漏洞，可能导致权限提升和跨租户资源访问。

CVSS 9.1 · Critical EPSS 0.46% · P38
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I. Basic Information for CVE-2025-55205

Vulnerability Information
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Vulnerability Title
Capsule tenant owners with "patch namespace" permission can hijack system namespaces label
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Capsule 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Capsule是Project Capsule开源的一个 Kubernetes 的多租户和基于策略的框架。 Capsule 0.10.3及之前版本存在安全漏洞，该漏洞源于命名空间标签注入漏洞，可能导致权限提升和跨租户资源访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
projectcapsule capsule < 0.10.4 -

II. Public POCs for CVE-2025-55205

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10161 chars
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III. Intelligence Information for CVE-2025-55205

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Vendor Advisories for CVE-2025-55205 (1)

IV. Related Vulnerabilities

Same product: capsule
Same vendor: projectcapsule
Same weakness: CWE-863

V. Comments for CVE-2025-55205

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