CVE-2026-42183

EPSS 0.05%

Argo Workflows: SSO RBAC Delegation Nil Pointer Dereference DoS (gatekeeper.go)

Published: 5/4/2026Modified: 5/12/2026

Also known as:GHSA-p4gq-3vxj-f4jqBIT-argo-workflows-2026-42183

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.

Affected packages (2)

Bitnami/argo-workflows>= 4.0.0, < 4.0.5
Go/github.com/argoproj/argo-workflows/v4>= 4.0.0, < 4.0.5

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 4.0	—	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

References (5)

ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-42183
PATCHhttps://github.com/argoproj/argo-workflows
WEBhttps://github.com/argoproj/argo-workflows/commit/c4cc17d0c034fa9a9cc01ef1af6c8016c93071d4
WEBhttps://github.com/argoproj/argo-workflows/releases/tag/v4.0.5
WEBhttps://github.com/argoproj/argo-workflows/security/advisories/GHSA-p4gq-3vxj-f4jq