CVE-2026-40886
Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernetes.
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/argoproj/argo-workflows/v4 | >= 4.0.0, < 4.0.5 | 4.0.5 |
| go | github.com/argoproj/argo-workflows/v3 | >= 3.7.0, < 3.7.14 | 3.7.14 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Argoproj | Argo Workflows | from 3.6.5 through 3.6.19 from 3.7.0 before 3.7.14 from 4.0.0 before 4.0.5 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-5jv8-h7qh-rf5p
- https://github.com/argoproj/argo-workflows/security/advisories/GHSA-5jv8-h7qh-rf5p
- https://nvd.nist.gov/vuln/detail/CVE-2026-40886
- 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