{"id":"CVE-2026-42183","state":"PUBLISHED","title":"Argo Workflows: SSO RBAC Delegation Nil Pointer Dereference DoS (gatekeeper.go)","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.","publishedAt":"2026-05-09T03:44:10.712Z","updatedAt":"2026-05-13T17:46:04.800Z","severity":{"score":2.3,"label":"Low","version":"4.0","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","source":"GitHub_M"},"assigner":"GitHub_M","products":["argoproj argo-workflows"],"affected":[{"vendor":"argoproj","product":"argo-workflows","versions":[{"version":">= 4.0.0, < 4.0.5","status":"affected"}]}],"references":["https://github.com/argoproj/argo-workflows/security/advisories/GHSA-p4gq-3vxj-f4jq","https://github.com/argoproj/argo-workflows/commit/c4cc17d0c034fa9a9cc01ef1af6c8016c93071d4","https://github.com/argoproj/argo-workflows/releases/tag/v4.0.5"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/42xxx/CVE-2026-42183.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-42183","state":"PUBLISHED","datePublished":"2026-05-09T03:44:10.712Z","dateUpdated":"2026-05-13T17:46:04.800Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-25T01:53:21.582Z"},"containers":{"cna":{"title":"Argo Workflows: SSO RBAC Delegation Nil Pointer Dereference DoS (gatekeeper.go)","descriptions":[{"lang":"en","value":"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":[{"vendor":"argoproj","product":"argo-workflows","versions":[{"version":">= 4.0.0, < 4.0.5","status":"affected"}]}],"references":[{"url":"https://github.com/argoproj/argo-workflows/security/advisories/GHSA-p4gq-3vxj-f4jq","name":"https://github.com/argoproj/argo-workflows/security/advisories/GHSA-p4gq-3vxj-f4jq","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/argoproj/argo-workflows/commit/c4cc17d0c034fa9a9cc01ef1af6c8016c93071d4","name":"https://github.com/argoproj/argo-workflows/commit/c4cc17d0c034fa9a9cc01ef1af6c8016c93071d4","tags":["x_refsource_MISC"]},{"url":"https://github.com/argoproj/argo-workflows/releases/tag/v4.0.5","name":"https://github.com/argoproj/argo-workflows/releases/tag/v4.0.5","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":2.3,"baseSeverity":"LOW","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","lang":"en","description":"CWE-476: NULL Pointer Dereference","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-09T03:44:10.712Z"},"source":{"advisory":"GHSA-p4gq-3vxj-f4jq","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-13T17:25:40.856061Z","id":"CVE-2026-42183","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-13T17:46:04.800Z"}}]}}}