Fission: Cross-namespace Environment reference via unvalidated EnvironmentRef in Function admission webhook
CVE-2026-49824

8.5HIGH

Key Information:

Vendor: Fission
Status: Fission
Vendor: CVE Published:; 10 June 2026

What is CVE-2026-49824?

Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.24.0, the Fission Function admission webhook (pkg/webhook/function.go) validated that spec.secrets[].namespace and spec.configmaps[].namespace equalled the function's own namespace but performed no equivalent check on spec.environment.namespace. This issue has been patched in version 1.24.0.