What’s Vulnerable › Vulnerabilities

CVE-2026-3288: ingress-nginx rewrite-target nginx configuration injection

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 6.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-09 · updated 2026-06-17
• Weakness: CWE-20

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.)

Affected products

• Kubernetes ingress-nginx: before 1.13.8; from 1.14.0 before 1.14.4 — fixed in 1.13.8, 1.14.4

How to fix

Upgrade to a fixed version: Kubernetes ingress-nginx 1.13.8, 1.14.4. Check the vendor advisory for mitigations.

References

• https://github.com/kubernetes/kubernetes/issues/137560
• http://www.openwall.com/lists/oss-security/2026/03/09/8
• https://github.com/bvabhishek/CVE-2026-3288-lab

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