Kubernetes ingress-nginx up to 1.13.6/1.14.1 Ingress Annotation input validation

Summaryinfo

A vulnerability was found in Kubernetes ingress-nginx up to 1.13.6/1.14.1 and classified as very critical. Affected by this issue is some unknown functionality of the component Ingress Annotation Handler. Such manipulation leads to input validation. This vulnerability is referenced as CVE-2026-1580. It is possible to launch the attack remotely. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in Kubernetes ingress-nginx up to 1.13.6/1.14.1. Affected by this issue is an unknown code of the component Ingress Annotation Handler. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.)

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-1580 since 01/29/2026. The exploitation is known to be easy. The attack may be launched remotely. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 02/08/2026).

The vulnerability scanner Nessus provides a plugin with the ID 297852 (Ingress-NGINX Controller < 1.13.7 / 1.14.x < 1.14.3 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.13.7 or 1.14.2 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (297852) and CERT Bund (WID-SEC-2026-0289). Once again VulDB remains the best source for vulnerability data.

Affected

• Open Source Kubernetes

Productinfo

Type

• Virtualization Software

Vendor

• Kubernetes

Name

• ingress-nginx

Version

• 1.13.0
• 1.13.1
• 1.13.2
• 1.13.3
• 1.13.4
• 1.13.5
• 1.13.6
• 1.14.0
• 1.14.1

License

• open-source

CPE 2.3info

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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