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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 是一个面向 Kubernetes 的多租户策略管理框架。在 0.13.7 版本之前，位于 中的 会对被禁止的元数据键进行不区分大小写的排序，随后使用 进行查找，而该函数假设列表已按字节序（byte-order）排序。当管理员配置的禁止列表中混合使用大写和小写键，导致“不区分大小写的排序”与“字节序”不一致时，二分查找可能会错误地返回“未找到”，即使该键实际存在于列表中。 在这种情况下，经过身份验证的租户所有者可以利用这一缺陷，使被遗漏的键通过 的校验，从而绕过已配置的命名空间、Service 或委托

CVSS 7.1 · High EPSS 0.33% · P27

Affected Version Matrix 1

VendorProduct Version RangeStatus
projectcapsule capsule < 0.13.7 affected
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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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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