CVE-2026-4342

ingress-nginx comment-based nginx configuration injection

Published: Mar 19, 2026Updated: May 19, 2026 Sources: CVE List NVD BDUCWE-20

8.8HIGH

Description

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.)

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:LPrivileges Required

Low

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:HAvailability

High

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Weaknesses

CWE-20 NVD-CWE-noinfo

Affected Products

Kubernetes

oss-project·USaka k8s

ingress-nginx

Cloud & SaaS

nginx ingress controllerOn-premNetwork Device

Networking Infrastructure / load-balancer-proxy

ООО «Ред Софт»

commercial·RUaka red soft

РЕД ОСOn-premOS

Operating Systems / linux-distro

The Kubernetes Authors

oss-projectaka kubernetes

ingress-nginxMixed

Cloud & SaaS / container-orchestration

Exploitability

Official Patch Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Initial Access

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References

https://github.com/kubernetes/kubernetes/issues/137893

github.com

http://www.openwall.com/lists/oss-security/2026/03/19/9

openwall.com

https://github.com/stuartMoorhouse/CVE-2026-4342

github.com

and 2 more references View all →

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