CVE-2026-61672
Capsule: Tenant owner bypasses Capsule's forbidden namespace/service/node label and annotation enforcement
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | High7.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:N |
| NVDNVD · Deferred | 3.1 | High7.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.33% · top 73% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.
Weakness
Affected products
- affected < 0.13.7
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gogithub.com/projectcapsule/capsuleGHSA-gjw4-3v3v-rqxg (opens in a new tab)
References (4)
- https://github.com/projectcapsule/capsule/security/advisories/GHSA-gjw4-3v3v-rqxg (opens in a new tab)x_refsource_CONFIRMexploit
- https://github.com/projectcapsule/capsule/pull/1982 (opens in a new tab)x_refsource_MISC
- https://github.com/projectcapsule/capsule/commit/755cef54bf4a1bc56d6692130132bc70755bef46 (opens in a new tab)x_refsource_MISC
- https://github.com/projectcapsule/capsule/releases/tag/v0.13.7 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-gjw4-3v3v-rqxg (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-61672)Record last updated .