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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/argoproj/argo-workflows/v4Go | >= 4.0.0, < 4.0.5 | 4.0.5 |
github.com/argoproj/argo-workflows/v3Go | >= 3.7.0, < 3.7.14 | 3.7.14 |
github.com/argoproj/argo-workflows/v3Go | >= 3.6.5, <= 3.6.19 | — |
Affected products
12- osv-coords11 versionspkg:apk/chainguard/kubeflow-pipelines-apiserverpkg:apk/chainguard/kubeflow-pipelines-cache_serverpkg:apk/chainguard/kubeflow-pipelines-persistence_agentpkg:apk/chainguard/kubeflow-pipelines-scheduledworkflowpkg:apk/wolfi/kubeflow-pipelines-apiserverpkg:apk/wolfi/kubeflow-pipelines-cache_serverpkg:apk/wolfi/kubeflow-pipelines-persistence_agentpkg:apk/wolfi/kubeflow-pipelines-scheduledworkflowpkg:bitnami/argo-workflowspkg:golang/github.com/argoproj/argo-workflows/v3pkg:golang/github.com/argoproj/argo-workflows/v4
< 2.16.0-r18+ 10 more
- (no CPE)range: < 2.16.0-r18
- (no CPE)range: < 2.16.0-r18
- (no CPE)range: < 2.16.0-r18
- (no CPE)range: < 2.16.0-r18
- (no CPE)range: < 2.16.0-r18
- (no CPE)range: < 2.16.0-r18
- (no CPE)range: < 2.16.0-r18
- (no CPE)range: < 2.16.0-r18
- (no CPE)range: >= 3.6.5, < 3.7.14
- (no CPE)range: >= 3.7.0, < 3.7.14
- (no CPE)range: >= 4.0.0, < 4.0.5
Patches
Vulnerability mechanics
References
3- github.com/argoproj/argo-workflows/security/advisories/GHSA-5jv8-h7qh-rf5pnvdExploitVendor AdvisoryWEB
- github.com/advisories/GHSA-5jv8-h7qh-rf5pghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-40886ghsaADVISORY
News mentions
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