CVE-2026-42183CWE-476

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

Low · published May 9, 2026

CVSS v4.0
2.3
EPSS
1%
Percentile
46.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
2.3 · LOW
Vector
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
EPSS
0.00573 · 46.6th percentile
Weakness
CWE-476 · NULL Pointer Dereference
Published
2026-05-09T03:44Z
EPSS history
Timeline
  • 09 MAY 03:44Z
    Argo Workflows: SSO RBAC Delegation Nil Pointer Dereference DoS (gatekeeper.go)
    cvelistv5