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CVE-2026-40886 is a denial-of-service vulnerability in Argo Workflows affecting versions 3.6.5 through 3.6.19, 3.7.0 through 3.7.13, and 4.0.0 through 4.0.4. The flaw is caused by unchecked array index access in the controller’s pod informer path, specifically in podGCFromPod(), when parsing the workflows.argoproj.io/pod-gc-strategy annotation on workflow pods. The implementation splits the annotation value on the "/" character and unconditionally accesses the second element; if the annotation is malformed and lacks the delimiter, this results in a Go runtime panic due to an index-out-of-range condition. Because the panic occurs inside a Kubernetes informer goroutine outside the controller’s recover() scope, the panic is not contained and crashes the entire Argo Workflows controller process. The malformed pod remains persisted in the Kubernetes API, so when the controller restarts it reprocesses the same poisoned pod and crashes again, creating a persistent crash loop until the offending pod or workflow is manually removed.
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A vulnerability in Argo Workflows that can corrupt controller state and cause a persistent crash loop/denial of service via a malformed workflows.argoproj.io/pod-gc-strategy annotation stored in the Kubernetes API.
A denial-of-service vulnerability in Argo Workflows caused by unchecked parsing of the workflows.argoproj.io/pod-gc-strategy annotation, allowing a malformed value to crash the controller and trigger a persistent CrashLoopBackOff.
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