CVE-2026-40886
Description
Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernetes. From 3.6.5 to 4.0.4, an unchecked array index in the pod informer's podGCFromPod() function causes a controller-wide panic when a workflow pod carries a malformed workflows.argoproj.io/pod-gc-strategy annotation. Because the panic occurs inside an informer goroutine (outside the controller's recover() scope), it crashes the entire controller process. The poisoned pod persists across restarts, causing a crash loop that halts all workflow processing until the pod is manually deleted. This vulnerability is fixed in 4.0.5 and 3.7.14.
How to fix
- argoproj argo_workflows3.7.14, 4.0.5 or later
- github.com/argoproj/argo-workflows/v44.0.5 or later
- github.com/argoproj/argo-workflows/v33.7.14 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| argoproj argo_workflows | 3.6.5 ≤ v ≤ 3.6.19, 3.7.0 ≤ v < 3.7.14, 4.0.0 ≤ v < 4.0.5 | 3.7.14, 4.0.5 |
| github.com/argoproj/argo-workflows/v4Go | 4.0.0 ≤ v < 4.0.5 | 4.0.5 |
| github.com/argoproj/argo-workflows/v3Go | 3.7.0 ≤ v < 3.7.14, 3.6.5 ≤ v ≤ 3.6.19, 3.6.5 ≤ v | 3.7.14 |
| github.com/argoproj/argo-workflowsGo | No range specified | — |
| github.com/argoproj/argo-workflows/v2Go | No range specified | — |
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