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.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/argoproj/argo-workflows/commit/c4cc17d0c034fa9a9cc01ef1af6c8016c93071d4	Patch
https://github.com/argoproj/argo-workflows/releases/tag/v4.0.5	Release Notes
https://github.com/argoproj/argo-workflows/security/advisories/GHSA-p4gq-3vxj-f4jq	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:argoproj:argo_workflows:*:*:*:*:*:go:*:*

History

14 May 2026, 18:40

Type	Values Removed	Values Added
References	~~() https://github.com/argoproj/argo-workflows/commit/c4cc17d0c034fa9a9cc01ef1af6c8016c93071d4 -~~	() https://github.com/argoproj/argo-workflows/commit/c4cc17d0c034fa9a9cc01ef1af6c8016c93071d4 - Patch
References	~~() https://github.com/argoproj/argo-workflows/releases/tag/v4.0.5 -~~	() https://github.com/argoproj/argo-workflows/releases/tag/v4.0.5 - Release Notes
References	~~() https://github.com/argoproj/argo-workflows/security/advisories/GHSA-p4gq-3vxj-f4jq -~~	() https://github.com/argoproj/argo-workflows/security/advisories/GHSA-p4gq-3vxj-f4jq - Exploit, Vendor Advisory
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 6.5
First Time		Argoproj Argoproj argo Workflows
CPE		cpe:2.3:a:argoproj:argo_workflows::::::go::*

09 May 2026, 04:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-09 04:16

Updated : 2026-05-14 18:40

NVD link : CVE-2026-42183

Mitre link : CVE-2026-42183

CVE.ORG link : CVE-2026-42183

JSON object : View

Products Affected

argoproj

argo_workflows

CWE

CWE-476

NULL Pointer Dereference

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