Namespace Label Injection Vulnerability in Capsule Framework by Project Capsule
CVE-2025-55205

9.1CRITICAL

Key Information:

Vendor

Projectcapsule

Status
Capsule
Vendor
CVE Published:
18 August 2025

What is CVE-2025-55205?

An injection vulnerability in the Capsule framework allows authenticated tenant users to insert arbitrary labels into essential system namespaces such as kube-system and default, undermining the multi-tenant security model. This flaw could lead to privilege escalation and exploitation of cross-tenant resources through TenantResource selectors. The integrity of Capsule's design is compromised, enabling users to bypass security boundaries set to protect multi-tenant environments. The issue has been resolved in Capsule version 0.10.4.

Affected Version(s)

capsule < 0.10.4

References

https://github.com/projectcapsule/capsule/security/adviso...
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https://github.com/projectcapsule/capsule/commit/e1f47fea...
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CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.
CVE-2025-55205 : Namespace Label Injection Vulnerability in Capsule Framework by Project Capsule