CVE•Published 2026-03-19•Modified 2026-05-19•1 article on news•6 live references•NVD data

CVE-2026-4342Kubernetes · Nginx_ingress_controller

Vulnerability data via NVD (ingested)

CVSS v3.1

8.8

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS percentile

Exploit Prediction Scoring System · top 85% of all CVEs

Weaknesses (CWE)

CWE-20Improper Input Validation

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.)

Timeline

Published 2026-03-19

Modified 2026-05-19

External references

NVD MITRE Exploit-DB GitHub PoC Sploitus VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-4342

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Kubernetes Nginx Ingress Controller"

All exposed Kubernetes Nginx Ingress Controller instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Nginx Ingress Controller"

HTTP body or banner mentions "Nginx Ingress Controller" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-4342