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CVE-2026-61672— Capsule: Tenant owner bypasses Capsule's forbidden namespace/service/node label and annotation enforcement

Quick assessment

Affected
projectcapsule capsule
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Capsule 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. W

CVSS 7.1 · High
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I. Basic Information for CVE-2026-61672

Vulnerability Information

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Vulnerability Title
Capsule: Tenant owner bypasses Capsule's forbidden namespace/service/node label and annotation enforcement
Source: CVE Program / CVE List V5
Vulnerability Description
Capsule 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的比较
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
projectcapsule capsule < 0.13.7 -

II. Public POCs for CVE-2026-61672

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III. Intelligence Information for CVE-2026-61672

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Patches & Fixes for CVE-2026-61672 (1)

Other References for CVE-2026-61672 (2)

Same Patch Batch · projectcapsule · 2026-09-18 · 3 CVEs total

CVE-2026-61794 6.8 MEDIUM Capsule: Malformed ForbiddenAnnotations.Regex can bypass Tenant validation and trigger nam
CVE-2026-61795 6.8 MEDIUM Capsule: hostnameRegexHandler.OnUpdate validates stale (old) Tenant regex, allowing invali

IV. Related Vulnerabilities

Same product: capsule
Same vendor: projectcapsule
Same weakness: CWE-697

V. Comments for CVE-2026-61672

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