ingress-nginx comment-based nginx configuration injection
Priority MEDIUM 43CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.
Summary
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.)
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01481 74th percentileScored 2026-11-07
Fix Fixed ingress-nginx (Kubernetes): 1.13.9, 1.14.5, 1.15.1k8s.io/ingress-nginx (Go): 0.0.0-20260319175635-5183b7d86137
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Kubernetes | ingress-nginx | before 1.13.9; before 1.14.5; before 1.15.1 | 1.13.9, 1.14.5, 1.15.1 | Patch available | CNA |
| — | k8s.io/ingress-nginx (Go) | before 0.0.0-20260319175635-5183b7d86137 | 0.0.0-20260319175635-5183b7d86137 | Patch available | GHSA-f53h-mxv9-cp98 |
- ingress-nginx VendorKubernetes Affected before 1.13.9; before 1.14.5; before 1.15.1 Fixed in 1.13.9, 1.14.5, 1.15.1 Patch available CNA
- k8s.io/ingress-nginx (Go) Vendor— Affected before 0.0.0-20260319175635-5183b7d86137 Fixed in 0.0.0-20260319175635-5183b7d86137 Patch available GHSA-f53h-mxv9-cp98
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:kubernetes:nginx_ingress_controller:*:*:*:*:*:*:*:* | before 1.13.9; 1.14.0 to before 1.14.5 | Vulnerable | Kubernetes |
| cpe:2.3:a:kubernetes:nginx_ingress_controller:1.15.0:*:*:*:*:*:*:* | 1.15.0 | Vulnerable | Kubernetes |
- cpe:2.3:a:kubernetes:nginx_ingress_controller:*:*:*:*:*:*:*:* Versions before 1.13.9; 1.14.0 to before 1.14.5 Vulnerable ·Kubernetes
- cpe:2.3:a:kubernetes:nginx_ingress_controller:1.15.0:*:*:*:*:*:*:* Versions 1.15.0 Vulnerable ·Kubernetes
Remediation
- Fix · CNA ingress-nginx (Kubernetes) Fixed in 1.13.9, 1.14.5, 1.15.1
- Fix · GHSA-f53h-mxv9-cp98 k8s.io/ingress-nginx (Go) Fixed in 0.0.0-20260319175635-5183b7d86137 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-4342
- 2026-10-03 Alias added: GHSA-f53h-mxv9-cp98
- 2026-10-25 EPSS moved to the 50th–90th percentile
References
Advisory 2
More Kubernetes Nginx Ingress Controller vulnerabilities
- TI-2018-16129 Improper input validation in Kubernetes k8s.gcr.io/defaultbackend CVSS 3.1MEDIUM 5.3
Sources
- CVE-2026-4342 · CVE Program
- CVE-2026-4342 · NVD
- FIRST EPSS
- GHSA-f53h-mxv9-cp98 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences