CVE-2026-77180: NGINX Ingress Controller vulnerability
When NGINX Ingress Controller is configured with Ingress annotations, an injection vulnerability exists in the configuration generator of NGINX Ingress Controller. Multiple user-controllable fields are written into the generated NGINX configuration without sanitization. An authenticated attacker with permission to create or modify these annotations may craft values that inject arbitrary NGINX configuration directives.
Impact: An authenticated attacker granted write access to NGINX Ingress Controller Ingress annotations through the Kubernetes API may be able to inject arbitrary NGINX configuration directives, create or delete files, or disable services. There is no data plane exposure; this is a control plane issue only.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Affected Software
Event History
Frequently Asked Questions
Who is exposed to this issue?
This is a control plane issue affecting deployments where NGINX Ingress Controller uses Ingress annotations. There is no data plane exposure.
What access does an attacker need?
An attacker must be authenticated to the Kubernetes API and have permission to create or modify NGINX Ingress Controller Ingress annotations. No user interaction is required.
What could an attacker do after exploitation?
They may inject arbitrary NGINX configuration directives through unsanitized annotation fields. The stated impacts include creating or deleting files and disabling services.
Are unsupported software versions covered by the evaluation?
No. Software versions that have reached End of Technical Support are not evaluated.