NULL pointer dereference in Argo Workflows - #VU126906
Published: April 23, 2026
Vulnerability identifier: #VU126906
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Argo
Affected software:
Argo Workflows
Argo Workflows
Detailed vulnerability description
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to a null pointer dereference in the rbacAuthorization() function in server/auth/gatekeeper.go when handling API requests from SSO users whose claims match a namespace-level RBAC rule but not an SSO-namespace rule. A remote user can send a request to an affected workflow namespace to cause a denial of service.
Exploitation requires SSO RBAC delegation to namespace to be enabled with SSO_DELEGATE_RBAC_TO_NAMESPACE=true.
Remediation
Install security update from vendor's website.