Capsule: Tenant owner bypasses Capsule's forbidden namespace/service/node label and annotation enforcement

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-61672
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-18 17:16:58 UTC
Updated2026-09-24 21:25:27 UTC
DescriptionCapsule is a multi-tenancy and policy-based framework for Kubernetes. Prior to 0.13.7, ForbiddenListSpec.ExactMatch in pkg/api/forbidden_list.go sorts denied metadata keys case-insensitively and then uses sort.SearchStrings, which assumes byte-order sorting. When an administrator's forbidden list mixes capitalized and lowercase keys or otherwise has different case-insensitive and byte ordering, the binary search can return false for a key that is present. An authenticated tenant owner can then pass the missed key through api.ValidateForbidden and bypass configured namespace, Service, or delegated node metadata restrictions, potentially influencing cluster policies, network exposure, or scheduling outside the tenant boundary. Uniformly lowercase lists whose two orderings coincide are not affected. This issue is fixed in version 0.13.7.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

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

EPSS: 0.003340000 probability, percentile 0.240910000 (date 2026-09-25)

Problem Types: CWE-697 | CWE-863 | CWE-697 CWE-697: Incorrect Comparison | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.1HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:N
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Projectcapsule Capsule affected < 0.13.7 Not specified

References

ReferenceSourceLinkTags
github.com/projectcapsule/capsule/pull/1982 [email protected] github.com
github.com/projectcapsule/capsule/commit/755cef54bf4a1bc56d6692130132bc7... [email protected] github.com
github.com/projectcapsule/capsule/releases/tag/v0.13.7 [email protected] github.com
github.com/projectcapsule/capsule/security/advisories/GHSA-gjw4-3v3v-rqxg 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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