CVE-2026-15228

Summary

Kong Kubernetes Ingress Controller (KIC) allows a user with namespace-scoped Secret creation privileges to cause a cluster-wide ingress configuration denial of service. KIC collects CA-certificate Secrets across all watched namespaces using a label selector alone, without ingress-class or namespace restrictions. The CA-certificate primary key is derived from a user-supplied field in the Secret. Duplicate CA-certificate IDs cause Kong Gateway to reject the entire configuration document and halting all ingress changes cluster-wide.

Affected Software

Weaknesses

• CWE-862: CWE-862
• CWE-400: CWE-400

Workarounds

Restrict watch scope: Set –watch-namespace (or env CONTROLLER_WATCH_NAMESPACE) to only include trusted namespaces. This prevents the embedded KIC from ingesting Secrets from untrusted namespaces.

Restrict Secret labeling via RBAC: Use Kubernetes RBAC to prevent untrusted users from creating or modifying Secrets with the labels konghq.com/secret=true and konghq.com/ca-cert=true. Consider using an admission webhook or OPA/Kyverno policy to enforce this label restriction.

Audit existing CA-cert Secrets: Inspect Secrets labeled konghq.com/ca-cert=true across all watched namespaces for unexpected or duplicate data.id values. Remove any that were not provisioned by a trusted operator.

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://github.com/Kong/kubernetes-ingress-controller/security/advisories/GHSA-g9h6-h2xj-mf78

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