CVE-2026-42183
Medium
Description
Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernetes. From version 4.0.0 to before version 4.0.5, a nil pointer dereference in server/auth/gatekeeper.go rbacAuthorization() causes a panic (denial of service) for SSO users whose claims match a namespace-level RBAC rule but not an SSO-namespace rule, when SSO_DELEGATE_RBAC_TO_NAMESPACE=true. This issue has been patched in version 4.0.5.
SeverityMedium
CVSS6.5
Exploit probability—
ProductArgoproj Argo Workflows
PublishedMay 9, 2026
First seenMay 9, 2026
Weakness typeCWE-476NULL pointer dereference
How to fix
Update
- argoproj argo_workflows4.0.5 or later
- github.com/argoproj/argo-workflows/v44.0.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| argoproj argo_workflows | 4.0.0 ≤ v < 4.0.5 | 4.0.5 |
| github.com/argoproj/argo-workflows/v4Go | 4.0.0 ≤ v < 4.0.5 | 4.0.5 |
| github.com/argoproj/argo-workflowsGo | No range specified | — |
| github.com/argoproj/argo-workflows/v2Go | No range specified | — |
| github.com/argoproj/argo-workflows/v3Go | No range specified | — |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.