CVE-2026-1580
HIGH
GHSA-9h3p-52vh-959w
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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3Tags
Description
A security issue was discovered in ingress-nginx where the `nginx.ingress.kubernetes.io/auth-method` 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 `nginx.ingress.kubernetes.io/auth-method` Ingress annotations allows authenticated attackers to execute commands within the controller context and access cluster-wide Secrets. This vulnerability affects Nginx and Kubernetes deployments where the ingress controller has default cluster-wide Secret access permissions. …
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Remediation
Within 24 hours: Audit all Ingress resources for suspicious `auth-method` annotations and identify which clusters run vulnerable ingress-nginx versions. Within 7 days: Implement network policies to restrict Ingress controller access, enforce admission controllers to validate Ingress annotations, and disable the `auth-method` annotation if unused. …
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