CVE-2026-40886 - Argo Workflows: Unchecked annotation parsing in pod informer crashes Argo Workflows controller

CVE-2026-40886 - Argo Workflows: Unchecked annotation parsing in pod informer crashes Argo Workflows controller

https://cvefeed.io/rssfeed/latest.atom / Thu, 04/23/2026 - 23:20
CVE ID :CVE-2026-40886
Published : April 23, 2026, 7:17 p.m. | 55 minutes ago
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.
Severity: 7.7 | HIGH
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