{"id":"CVE-2025-55205","aliases":["GHSA-fcpm-6mxq-m5vv","GO-2025-3893"],"url":"https://o3.security/vulnerability/CVE-2025-55205","summary":"Capsule tenant owners with \"patch namespace\" permission can hijack system namespaces label","details":"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.","published":"2025-08-18T16:28:51.317Z","modified":"2026-08-08T03:47:56.636792271Z","cvss":{"score":9,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/projectcapsule/capsule","fixedVersion":"0.10.4"}],"fix":{"url":"https://github.com/projectcapsule/capsule/commit/e1f47feade6e1695b2204407607d07c3b3994f6e","label":"projectcapsule/capsule@e1f47fe"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/55xxx/CVE-2025-55205.json"},{"type":"ADVISORY","url":"https://github.com/projectcapsule/capsule/security/advisories/GHSA-fcpm-6mxq-m5vv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-55205"},{"type":"FIX","url":"https://github.com/projectcapsule/capsule/commit/e1f47feade6e1695b2204407607d07c3b3994f6e"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-08T03:47:56.636792271Z"}}