SB2026031120 - Remote code execution in Ingress-NGINX Controller for Kubernetes

Description

This security bulletin contains information about 1 vulnerability.

1) Code Injection (CVE-ID: CVE-2026-3288)

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:U/U:Amber

The vulnerability allows a remote user to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation where the "nginx.ingress.kubernetes.io/rewrite-target" Ingress annotation can be used to inject configuration into nginx. A remote user can inject and execute arbitrary code in the context of the ingress-nginx controller.

Remediation

Install update from vendor's website.

References

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