CVE-2026-42183 Details
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.
A denial-of-service vulnerability has been identified in Argo Workflows versions 4.0.0 prior to 4.0.5. The issue arises from a nil pointer dereference in the RBAC authorization function, specifically when the SSO delegation to namespace is enabled. This flaw causes the server to panic for SSO users whose claims align with namespace-level RBAC rules but not with SSO-namespace rules. The vulnerability has been patched in version 4.0.5.
Users can upgrade to Argo Workflows version 4.0.5 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 13, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| argoproj argo workflows | >= 4.0.0, < 4.0.5 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 24, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 14, 2026 | Initial Analysis | [email protected] |
| May 9, 2026 | New CVE Received | [email protected] |