CVE-2026-55636

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Source
https://cve.org/CVERecord?id=CVE-2026-55636
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55636.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-55636
Aliases
Downstream
Related
Published
2026-09-15T15:27:44Z
Modified
2026-09-17T03:47:27Z
Severity
  • 5.7 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:H/A:L CVSS Calculator
Summary
Capsule: Incomplete fix of CVE-2026-30963: singular/plural typo leaves namespaces/finalize unprotected
Details

Capsule is a multi-tenancy and policy-based framework for Kubernetes. From 0.13.0 until 0.13.6, charts/capsule/templates/configuration.yaml configures the validating webhook with namespace/finalize instead of the Kubernetes resource name namespaces/finalize. A user with namespaces/finalize RBAC can send a PUT request to /api/v1/namespaces/{namespace}/finalize, and the singular rule never matches the plural resource, so the validating webhook is not invoked and the user can change the namespace tenant label. matchPolicy: Equivalent does not compensate because it handles API group and version equivalence rather than resource-name errors. This vulnerability is fixed in 0.13.6.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-863"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55636.json"
}
References

Affected packages

Git / github.com/projectcapsule/capsule

Affected ranges

Type
GIT
Repo
https://github.com/projectcapsule/capsule
Events
Introduced
c6e109ca46ed7de3a0f371df75e8abc993413a64
Fixed
af2f37793e789b2301da8ed8dfb52ab60affebb6
Fixed
f4085fd13e669141562ec432ce2e020734d77bfa
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0.13.0"
        },
        {
            "fixed": "0.13.6"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v0.*
v0.13.0
v0.13.1
v0.13.2
v0.13.3
v0.13.4
v0.13.5

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55636.json"