CVE-2026-42183: CWE-476: NULL Pointer Dereference in argoproj argo-workflows
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.
AI Analysis
Technical Summary
Argo Workflows, an open source Kubernetes-native workflow engine, contains a NULL pointer dereference (CWE-476) vulnerability in the rbacAuthorization() function within server/auth/gatekeeper.go. This occurs when SSO_DELEGATE_RBAC_TO_NAMESPACE=true and a user's claims match a namespace-level RBAC rule but not an SSO-namespace rule, causing a panic and denial of service. The vulnerability affects versions from 4.0.0 up to but not including 4.0.5. The issue has been addressed and patched in version 4.0.5.
Potential Impact
Exploitation of this vulnerability results in a denial of service condition due to a server panic triggered by a NULL pointer dereference. This affects SSO users under specific RBAC configurations, potentially disrupting workflow orchestration services. The CVSS 4.0 score is low (2.3), indicating limited impact severity.
Mitigation Recommendations
Upgrade Argo Workflows to version 4.0.5 or later, where this vulnerability has been patched. No other mitigation or workaround is indicated. Patch status is confirmed by the vendor advisory stating the fix is included in version 4.0.5.
CVE-2026-42183: CWE-476: NULL Pointer Dereference in argoproj argo-workflows
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.
CVSS v4.0
Score 2.3low
Affected software
pkg:github/argoproj/argo-workflowsRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Argo Workflows, an open source Kubernetes-native workflow engine, contains a NULL pointer dereference (CWE-476) vulnerability in the rbacAuthorization() function within server/auth/gatekeeper.go. This occurs when SSO_DELEGATE_RBAC_TO_NAMESPACE=true and a user's claims match a namespace-level RBAC rule but not an SSO-namespace rule, causing a panic and denial of service. The vulnerability affects versions from 4.0.0 up to but not including 4.0.5. The issue has been addressed and patched in version 4.0.5.
Potential Impact
Exploitation of this vulnerability results in a denial of service condition due to a server panic triggered by a NULL pointer dereference. This affects SSO users under specific RBAC configurations, potentially disrupting workflow orchestration services. The CVSS 4.0 score is low (2.3), indicating limited impact severity.
Mitigation Recommendations
Upgrade Argo Workflows to version 4.0.5 or later, where this vulnerability has been patched. No other mitigation or workaround is indicated. Patch status is confirmed by the vendor advisory stating the fix is included in version 4.0.5.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-25T01:53:21.582Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69ffe1afcbff5d8610eaca02
Added to database: 05/10/2026, 01:38:55 UTC
Last enriched: 05/17/2026, 09:35:01 UTC
Last updated: 06/24/2026, 20:05:57 UTC
Views: 76
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