CVE-2026-4342
Last modified
CVE-2026-4342 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 1.49% chance of exploitation in the next 30 days.
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.)
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Kubernetes | Nginx Ingress Controller | < 1.13.9 |
| Kubernetes | Nginx Ingress Controller | >= 1.14.0, < 1.14.5 |
| Kubernetes | Nginx Ingress Controller | 1.15.0 |
References
- https://github.com/kubernetes/kubernetes/issues/137893Issue Tracking
- http://www.openwall.com/lists/oss-security/2026/03/19/9Mailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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