CVE-2026-42183: CWE-476: NULL Pointer Dereference in argoproj argo-workflows
CVE-2026-42183 is a low-severity vulnerability in Argo Workflows versions 4. 0. 0 to before 4. 0. 5. It involves a nil pointer dereference in the rbacAuthorization() function within server/auth/gatekeeper. go, which causes a panic leading to a denial of service. This occurs for SSO users whose claims match a namespace-level RBAC rule but not an SSO-namespace rule when the configuration SSO_DELEGATE_RBAC_TO_NAMESPACE is set to true. The issue has been fixed in version 4. 0.
AI Analysis
Technical Summary
Argo Workflows, a container-native workflow engine for Kubernetes, contained a vulnerability (CWE-476: NULL Pointer Dereference) in versions 4.0.0 through 4.0.4. The flaw is triggered in the rbacAuthorization() function when processing SSO user claims under specific RBAC configurations (SSO_DELEGATE_RBAC_TO_NAMESPACE=true). This results in a nil pointer dereference causing the server to panic and deny service. The vulnerability was addressed and patched in version 4.0.5.
Potential Impact
The vulnerability causes a denial of service by crashing the Argo Workflows server component when certain SSO user claims trigger the nil pointer dereference. There is no indication of privilege escalation, data disclosure, or code execution. The impact is limited to service availability disruption for affected configurations.
Mitigation Recommendations
A fix is available in Argo Workflows version 4.0.5. Users running versions from 4.0.0 up to but not including 4.0.5 should upgrade to version 4.0.5 or later to remediate this issue. No other mitigation steps are indicated by the vendor advisory.
CVE-2026-42183: CWE-476: NULL Pointer Dereference in argoproj argo-workflows
Description
CVE-2026-42183 is a low-severity vulnerability in Argo Workflows versions 4. 0. 0 to before 4. 0. 5. It involves a nil pointer dereference in the rbacAuthorization() function within server/auth/gatekeeper. go, which causes a panic leading to a denial of service. This occurs for SSO users whose claims match a namespace-level RBAC rule but not an SSO-namespace rule when the configuration SSO_DELEGATE_RBAC_TO_NAMESPACE is set to true. The issue has been fixed in version 4. 0.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Argo Workflows, a container-native workflow engine for Kubernetes, contained a vulnerability (CWE-476: NULL Pointer Dereference) in versions 4.0.0 through 4.0.4. The flaw is triggered in the rbacAuthorization() function when processing SSO user claims under specific RBAC configurations (SSO_DELEGATE_RBAC_TO_NAMESPACE=true). This results in a nil pointer dereference causing the server to panic and deny service. The vulnerability was addressed and patched in version 4.0.5.
Potential Impact
The vulnerability causes a denial of service by crashing the Argo Workflows server component when certain SSO user claims trigger the nil pointer dereference. There is no indication of privilege escalation, data disclosure, or code execution. The impact is limited to service availability disruption for affected configurations.
Mitigation Recommendations
A fix is available in Argo Workflows version 4.0.5. Users running versions from 4.0.0 up to but not including 4.0.5 should upgrade to version 4.0.5 or later to remediate this issue. No other mitigation steps are indicated by the vendor advisory.
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: 5/10/2026, 1:38:55 AM
Last enriched: 5/10/2026, 1:39:42 AM
Last updated: 5/10/2026, 8:55:29 AM
Views: 9
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