CVE-2026-4342

What it is

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.)

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. High risk of data exposure, data tampering, service disruption.

Exploit odds

1.5% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2026-03-19 22:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 10:56 UTC Last updatedMost recent change to the record

Details

Published

2026-03-19 22:16 UTC

Last modified

2026-06-17 10:56 UTC

Exploit probability

1.5% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

Record status

Analyzed

Affected

• Kubernetes nginx Ingress Controller < 1.13.9
• Kubernetes nginx Ingress Controller < 1.14.5
• Kubernetes nginx Ingress Controller 1.15.0

Attack profile CVSS 3.1 · 8.8

Attack vector

Network

Complexity

Low

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High