{"id":"BIT-argo-workflows-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":["CVE-2026-42183","GHSA-p4gq-3vxj-f4jq","GO-2026-5527"],"modified":"2026-09-10T16:01:08.928833171Z","published":"2026-05-12T08:38:43.638Z","database_specific":{"severity":"Medium","cpes":["cpe:2.3:a:argo_workflows_project:argo_workflows:*:*:*:*:*:kubernetes:*:*"]},"references":[{"type":"FIX","url":"https://github.com/argoproj/argo-workflows/commit/c4cc17d0c034fa9a9cc01ef1af6c8016c93071d4"},{"type":"ARTICLE","url":"https://github.com/argoproj/argo-workflows/releases/tag/v4.0.5"},{"type":"ADVISORY","url":"https://github.com/argoproj/argo-workflows/security/advisories/GHSA-p4gq-3vxj-f4jq"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42183"}],"affected":[{"package":{"name":"argo-workflows","ecosystem":"Bitnami","purl":"pkg:bitnami/argo-workflows"},"ranges":[{"type":"SEMVER","events":[{"introduced":"4.0.0"},{"fixed":"4.0.5"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/argo-workflows/BIT-argo-workflows-2026-42183.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}],"schema_version":"1.9.0"}