CVE-2026-55636
Description
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/projectcapsule/capsuleGo | >= 0.13.0, < 0.13.6 | 0.13.6 |
Affected products
3- ghsa-coords2 versionspkg:golang/github.com/projectcapsule/capsulepkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2016.0
>= 0.13.0, < 0.13.6+ 1 more
- (no CPE)range: >= 0.13.0, < 0.13.6
- (no CPE)range: < 0.0.20260723T184607-160000.1.1
Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-gwxr-7h77-7777ghsaADVISORY
- github.com/projectcapsule/capsule/security/advisories/GHSA-gwxr-7h77-7777nvdWEB
- github.com/projectcapsule/capsule/commit/af2f37793e789b2301da8ed8dfb52ab60affebb6nvd
- github.com/projectcapsule/capsule/pull/1966nvd
- github.com/projectcapsule/capsule/releases/tag/v0.13.6nvd
News mentions
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