CVE-2026-16543

Kong Operator cluster-wide ingress configuration DoS via embedded KIC CA-certificate ID collision

State: Published
Severity: 7.1 High
Published: Jul 29, 2026
Updated: Jul 29, 2026
Reserved: Jul 22, 2026

Description

Kong Operator's embedded Kong Kubernetes Ingress Controller (KIC) allows a user with namespace-scoped Secret creation privileges to cause a cluster-wide ingress configuration denial of service. The embedded 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.

Scores

CVSS	Score	Vector	Source
4.0	7.1 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	Kong

Weaknesses

Affected Products

Product	Versions
Kong/kong-operator	2.2.0 to before 2.2.3Affected 2.1.0 to before 2.1.9Affected before 2.0.11Affected

References

https://github.com/Kong/kong-operator/security/advisories/GHSA-h4fh-j7xg-vwcx

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