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Vulnerability record · CVE-2026-4342 · published 19 March 2026

CVE-2026-4342: Kubernetes nginx ingress controller improper input validation vulnerability

Kubernetes · Nginx Ingress Controller

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.)

8.8 CVSS 3.1 High EPSS 0.60% · top 53.2% CWE-20 · Improper input validation
8.8CVSS 3.1 base score
0.60%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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.)

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/kubernetes/kubernetes/issues/137893 Issue Tracking
http://www.openwall.com/lists/oss-security/2026/03/19/9 Mailing ListThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-4342), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.