CVE-2026-77180

Summary

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

Weaknesses

• CWE-76: CWE-76 Improper Neutralization of Equivalent Special Elements

Workarounds

• Restrict Kubernetes Role-based Access Control (RBAC) create, update, and patch permissions on VirtualServer, VirtualServerRoute, Policy, DosProtectedResource, and Ingress resources to trusted cluster administrators only.
• Deploy an admission policy (Kyverno, OPA Gatekeeper, or ValidatingAdmissionPolicy) that rejects resources containing special characters in user-controlled fields.

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

References

• https://my.f5.com/manage/s/article/K000162601

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