High [CVE-2026-55723] When NGINX Ingress Controller is configured with Custom Resource Definitions (CRDs) or Ingress annotations, an injection vulnerability exists in the configuration generator of NGINX Ingress Controller
This high-severity F5 advisory covers CVE-2026-55723 affecting NGINX Ingress Controller.
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Summary
When NGINX Ingress Controller is configured with Custom Resource Definitions (CRDs) or 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 CRDs or annotations may craft values that inject arbitrary NGINX configuration directives.
Impact: 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.
- NGINX Ingress Controller 5.0.0 before 5.5.2
- NGINX Ingress Controller 2026-lts-r1 before 2026-lts-r3
Official advisory · high-confidence parse· fetched 4 months ago·verify at source
- 5.5.2
- 2026-lts-r3
Official advisory · high-confidence parse· fetched 4 months ago·verify at source
Mitigation checklist
- Impact: An authenticated attacker granted write access to NGINX Ingress Controller CRDs or Ingress annotations through the Kubernetes API may be able to inject arbitrary NGINX configuration directives, create or delete files, or disable services.
Official advisory · high-confidence parse· fetched 4 months ago·verify at source
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