Critical Code Execution Vulnerability in Kubernetes ingress-nginx Disclosed

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Critical Code Execution Vulnerability in Kubernetes ingress-nginx Disclosed

First seen 21 Mar 2026, 11:56 UTC • •72.0

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ThreatCluster •March 22, 2026 at 11:43 UTC

•CVE-2026-4342 allows arbitrary code execution in ingress-nginx through malicious Ingress annotations.
•Affected versions include ingress-nginx prior to v1.13.9, v1.14.5, and v1.15.1.
•Immediate patching and enhanced monitoring are recommended to mitigate risks.

A high-severity vulnerability, CVE-2026-4342, was disclosed on March 19, 2026, affecting ingress-nginx versions prior to v1.13.9, v1.14.5, and v1.15.1. This vulnerability allows attackers with low-level privileges to inject arbitrary configurations into nginx through malicious Ingress annotations, potentially leading to full remote code execution and exposure of sensitive Kubernetes Secrets. Organizations using affected versions are urged to upgrade immediately to mitigate risks of data breaches and operational downtime. The vulnerability arises from insufficient validation of Ingress annotations, significantly amplifying the impact due to the default access to all Secrets cluster-wide. As of March 20, 2026, the Kubernetes community has recommended immediate patching and enhanced monitoring to detect suspicious activities. Additionally, ingress-nginx will cease official maintenance after March 2026, prompting users to consider alternative solutions.

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Updated 195d ago How this analysis works

Timeline

2026-03-19

CVE-2026-4342 published

2026-03-20

Vulnerability disclosed by Kubernetes community

2026-03-20

Urgent patching recommendations issued

2026-03-20

Ingress-nginx maintenance announcement

More articles in this cluster (2)

Threat Graph

7 entities, 10 inferred relationships (STIX 2.1).

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Technique (2)

Data Breach
Zero-day Exploit

Vulnerability (2)

CVE-2026-4342
Ingress-nginx Command Injection Vulnerability

Affected Platform (2)

Ingress-nginx
Kubernetes

Tool (1)

Nginx

Relationships

Nginx exploits CVE-2026-4342
Nginx exploits Ingress-nginx Command Injection Vulnerability
CVE-2026-4342 targets Ingress-nginx
CVE-2026-4342 targets Kubernetes
Ingress-nginx Command Injection Vulnerability targets Ingress-nginx
Ingress-nginx Command Injection Vulnerability targets Kubernetes
Data Breach targets Ingress-nginx
Data Breach targets Kubernetes
Zero-day Exploit targets Ingress-nginx
Zero-day Exploit targets Kubernetes

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