CVE-2026-4342: ingress-nginx comment-based nginx configuration injection

March 20, 2026

A security issue was discovered in ingress-nginx where a combination of Ingress annotations can be used to inject configuration into nginx. This can lead to arbitrary code execution in the context of the ingress-nginx controller, and disclosure of Secrets accessible to the controller. (Note that in the default installation, the controller can access all Secrets cluster-wide.)

References

github.com/advisories/GHSA-f53h-mxv9-cp98
github.com/kubernetes/ingress-nginx
github.com/kubernetes/ingress-nginx/commit/5183b7d861377a9a2f6d2acaf44f8f6abd5cd0aa
github.com/kubernetes/kubernetes/issues/137893
nvd.nist.gov/vuln/detail/CVE-2026-4342

Code Behaviors & Features

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