{"id":"CVE-2026-42183","summary":"Argo Workflows: SSO RBAC Delegation Nil Pointer Dereference DoS (gatekeeper.go)","details":"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.","aliases":["BIT-argo-workflows-2026-42183","GHSA-p4gq-3vxj-f4jq","GO-2026-5527"],"modified":"2026-07-31T18:30:09.147395063Z","published":"2026-05-09T03:44:10.712Z","related":["CGA-cxfq-6r4q-6rf3","openSUSE-SU-2026:21483-1"],"database_specific":{"cwe_ids":["CWE-476"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42183.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/argoproj/argo-workflows/releases/tag/v4.0.5"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42183.json"},{"type":"ADVISORY","url":"https://github.com/argoproj/argo-workflows/security/advisories/GHSA-p4gq-3vxj-f4jq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42183"},{"type":"FIX","url":"https://github.com/argoproj/argo-workflows/commit/c4cc17d0c034fa9a9cc01ef1af6c8016c93071d4"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/argoproj/argo-workflows","events":[{"introduced":"a8bff4a72130bc1a13d95c6f73ff3fafec880287"},{"fixed":"0ab1452144d8f4d57c50b37ce50dad218868e950"},{"fixed":"c4cc17d0c034fa9a9cc01ef1af6c8016c93071d4"}],"database_specific":{"cpe":"cpe:2.3:a:argoproj:argo_workflows:*:*:*:*:*:go:*:*","extracted_events":[{"introduced":"4.0.0"},{"fixed":"4.0.5"}],"source":["CPE_RANGE","REFERENCES"]}}],"versions":["v4.0.4","v4.0.3","v4.0.2","v4.0.1","v4.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42183.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"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"}]}