Flux2 vulnerable to Denial of Service due to Improper use of metav1.Duration

Summary

Flux is an open and extensible continuous delivery solution for Kubernetes. Versions prior to 0.35.0 are subject to a Denial of Service. Users that have permissions to change Flux’s objects, either through a Flux source or directly within a cluster, can provide invalid data to fields `.spec.interval` or `.spec.timeout` (and structured variations of these fields), causing the entire object type to stop being processed. This issue is patched in version 0.35.0. As a workaround, Admission controllers can be employed to restrict the values that can be used for fields `.spec.interval` and `.spec.timeout`, however upgrading to the latest versions is still the recommended mitigation.

Timeline

1. Oct 21, 2022, 12:00 AM UTCCVE published
2. Apr 23, 2025, 1:56 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Apr 23, 2025, 4:45 PM UTCRecord last updated

Affected versions

• fluxcd flux2

  fixed in 0.35.0

• github.com/fluxcd/helm-controller/apiGo

  fixed in 0.26.0

• github.com/fluxcd/image-automation-controller/apiGo

  fixed in 0.26.1

• github.com/fluxcd/image-reflector-controller/apiGo

  fixed in 0.22.1

• github.com/fluxcd/kustomize-controller/apiGo

  fixed in 0.30.0

• github.com/fluxcd/notification-controller/apiGo

  fixed in 0.28.0

• github.com/fluxcd/source-controller/apiGo

  fixed in 0.30.0

• github.com/fluxcd/flux2Go

  From 0.1.0 · fixed in 0.35.0

• github.com/fluxcd/source-controllerGo

  From 0.0.1-alpha-1 · fixed in 0.30.0

• github.com/fluxcd/kustomize-controllerGo

  From 0.0.1-alpha-1 · fixed in 0.29.0

• github.com/fluxcd/helm-controllerGo

  From 0.0.1-alpha-1 · fixed in 0.24.0

• github.com/fluxcd/notification-controllerGo

  From 0.0.1-alpha-1 · fixed in 0.27.0

• github.com/fluxcd/image-automation-controllerGo

  From 0.1.0 · fixed in 0.26.0

• github.com/fluxcd/image-reflector-controllerGo

  From 0.1.0 · fixed in 0.22.0

References 2