Capsule: Incomplete fix of CVE-2026-30963: singular/plural typo leaves namespaces/finalize unprotected

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Summary

CVECVE-2026-55636
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-15 16:17:14 UTC
Updated2026-09-30 17:51:56 UTC
DescriptionCapsule 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.

Risk And Classification

Primary CVSS: v3.1 5.7 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:H/A:L

EPSS: 0.003850000 probability, percentile 0.299750000 (date 2026-09-29)

Problem Types: CWE-863 | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.7MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:H/A:L
3.1CNADECLARED5.7MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:H/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:H/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Projectcapsule Capsule affected >= 0.13.0, < 0.13.6 Not specified

References

ReferenceSourceLinkTags
github.com/projectcapsule/capsule/security/advisories/GHSA-gwxr-7h77-7777 [email protected] github.com
github.com/projectcapsule/capsule/pull/1966 [email protected] github.com
github.com/projectcapsule/capsule/releases/tag/v0.13.6 [email protected] github.com
github.com/projectcapsule/capsule/commit/af2f37793e789b2301da8ed8dfb52ab... [email protected] github.com
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