CVE-2026-40886
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| argoproj | argo-workflows | >= 4.0.0, < 4.0.5 | affected |
| argoproj | argo-workflows | >= 3.7.0, < 3.7.14 | affected |
| argoproj | argo-workflows | >= 3.6.5, <= 3.6.19 | affected |
Weaknesses
- CWE-129: CWE-129: Improper Validation of Array Index
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: poc
- Automatable: no
- Technical Impact: partial
Additional References
github.com/argoproj/argo-workflows: Argo Workflows: Denial of Service via malformed workflow pod annotation
Additional References
- https://access.redhat.com/security/cve/CVE-2026-40886
- https://bugzilla.redhat.com/show_bug.cgi?id=2461236
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40886.json
References
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