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CVE-2026-42183— Argo Workflows: SSO RBAC Delegation Nil Pointer Dereference DoS (gatekeeper.go)

Quick assessment

Affected
argoproj argo-workflows
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Argo Workflows是Argo项目的一个用于 Kubernetes 的开源容器原生工作流引擎。 Argo Workflows 4.0.0版本至4.0.5之前版本存在代码问题漏洞，该漏洞源于server/auth/gatekeeper.go中rbacAuthorization()函数空指针取消引用，可能导致SSO用户发生恐慌。

AI Predicted 5.3 Difficulty: Trivial EPSS 0.57% · P46

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
argoproj argo-workflows >= 4.0.0, < 4.0.5 affected
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I. Basic Information for CVE-2026-42183

Vulnerability Information
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Vulnerability Title
Argo Workflows: SSO RBAC Delegation Nil Pointer Dereference DoS (gatekeeper.go)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
Argo Workflows 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Argo Workflows是Argo项目的一个用于 Kubernetes 的开源容器原生工作流引擎。 Argo Workflows 4.0.0版本至4.0.5之前版本存在代码问题漏洞，该漏洞源于server/auth/gatekeeper.go中rbacAuthorization()函数空指针取消引用，可能导致SSO用户发生恐慌。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
argoproj argo-workflows >= 4.0.0, < 4.0.5 -

II. Public POCs for CVE-2026-42183

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III. Intelligence Information for CVE-2026-42183

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Patches & Fixes for CVE-2026-42183 (1)

Vendor Advisories for CVE-2026-42183 (1)

Same Patch Batch · argoproj · 2026-05-09 · 5 CVEs total

CVE-2026-42296 8.1 HIGH Argo Workflows has incomplete fix for CVE-2026-31892: hostNetwork, securityContext, servic
CVE-2026-42294 Argo Workflows: Unauthenticated Memory Exhaustion (DoS) in Webhook Interceptor
CVE-2026-42297 Argo Workflows Is Missing Authorization in Sync ConfigMap Provider
CVE-2026-42295 Argo Workflows: Exposure of artifact repository credentials

IV. Related Vulnerabilities

Same product: argo-workflows
Same vendor: argoproj
Same weakness: CWE-476

V. Comments for CVE-2026-42183

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