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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/projectcapsule/capsule/commit/755cef54bf4a1bc56d6692130132bc7
- https://github.com/projectcapsule/capsule/pull/1982
- https://github.com/projectcapsule/capsule/releases/tag/v0.13.7
- https://github.com/projectcapsule/capsule/security/advisories/GHSA-gjw4-3v3v-rqx
FAQ
What is CVE-2026-61672?
CVE-2026-61672 is a vulnerability with a CVSS score of 7.1 (HIGH). 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 ...
How severe is CVE-2026-61672?
CVE-2026-61672 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-61672?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.