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Tool Directory

CVE-2026-3288

HighPublished

ingress-nginx rewrite-target nginx configuration injection

Published: Mar 9, 2026
Updated: Apr 30, 2026
Assigning CNA: kubernetes
Evidence observed: Aug 25, 2026

Primary CVSS

8.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

6.3%

Low · next 30 days

Percentile: 93.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.)

Sources

CVE-2026-3288-labPoC
Docker-based vulnerable lab for CVE-2026-3288 NGINX Ingress configuration injection, with exploit scripts, detection monitoring, and remediation guidance for authorized security training.
CVE-2026-3288Research
Walkthrough: ingress-nginx Configuration Injection via rewrite-target Annotation

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