Vulnerability Details CVE-2026-42183
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 16.4%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2026-42183
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cpe:2.3:a:argoproj:argo_workflows:4.0.0
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cpe:2.3:a:argoproj:argo_workflows:4.0.1
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cpe:2.3:a:argoproj:argo_workflows:4.0.2
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cpe:2.3:a:argoproj:argo_workflows:4.0.3
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cpe:2.3:a:argoproj:argo_workflows:4.0.4