CVE-2026-3288
HIGHCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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2Tags
Description
A security issue was discovered in ingress-nginx where the `nginx.ingress.kubernetes.io/rewrite-target` Ingress annotation 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.)
Analysis
Arbitrary code execution in ingress-nginx controllers via malicious rewrite-target annotations allows authenticated attackers to execute commands and exfiltrate cluster secrets. Kubernetes administrators using ingress-nginx are at risk, particularly in default configurations where the controller has cluster-wide secret access. …
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Remediation
Within 24 hours: Inventory all ingress-nginx deployments and identify which are internet-facing or process untrusted traffic; implement network segmentation to restrict access to ingress controller endpoints. Within 7 days: Deploy WAF rules to detect and block suspicious rewrite-target annotation patterns; implement admission controllers to validate and restrict ingress annotation values. …
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