CVE-2026-4342

A security issue was discovered in ingress-nginx where a combination of Ingress annotations 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.)

Score

CVSS 3.1 8.8 High

Status

Analyzed - jordan@liggitt.net

Published

2026-03-19

Last modified

2026-03-21

Weaknesses

CWE-20

Affected products

• Ingress-nginx (Kubernetes)
• Nginx Ingress Controller (Kubernetes)

References

• https://github.com/kubernetes/kubernetes/issues/137893
• http://www.openwall.com/lists/oss-security/2026/03/19/9