{"id":"CVE-2026-37236","title":"grpc-gateway v2.28.0 is vulnerable to Incorrect Access Control","summary":"grpc-gateway v2.28.0 is vulnerable to Incorrect Access Control. The application processes the X-HTTP-Method-Override header in ServeMux.ServeHTTP without restricting allowed methods. When a POST request with Content-Type application/x-ww…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-639","CWE-444"],"published":"2026-08-28","updated":"2026-09-08","sourceUpdated":"2026-09-08T19:42:20.313","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-37236","references":[{"url":"https://github.com/grpc-ecosystem/grpc-gateway","label":"cve@mitre.org"},{"url":"https://github.com/grpc-ecosystem/grpc-gateway/commit/72123cd4f32545f6e1376873f412dcdcbcf29acc","label":"cve@mitre.org"},{"url":"https://s00me00ne.com/cve/cve-2026-37236/","label":"cve@mitre.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-37236.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-37236"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2525631"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-37236"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-37236"}],"tags":["nvd","csaf","vex","red-hat","score-dispute"],"epss":0.0044,"epssPercentile":0.37537,"ingestedAt":"2026-09-08T20:10:03.159Z","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","affected":["cryostat 4","migration_toolkit_for_applications 8","multicluster_global_hub","openshift_serverless","advanced_cluster_management_for_kubernetes 2","ceph_storage 5","ceph_storage 6","ceph_storage 7","ceph_storage 8","ceph_storage 9","enterprise_linux 8","openshift_ai_rhoai","openshift_container_platform 4","openshift_gitops","openshift_virtualization 4"],"scores":{"nvd":9.8,"vendor":5.4},"slug":"CVE-2026-37236","body":"## Overview\n\ngrpc-gateway v2.28.0 is vulnerable to Incorrect Access Control. The application processes the X-HTTP-Method-Override header in ServeMux.ServeHTTP without restricting allowed methods. When a POST request with Content-Type application/x-www-form-urlencoded includes this header, the request method is rewritten to an arbitrary attacker-supplied value before routing. This allows bypassing method-based access controls enforced by upstream proxies or WAFs.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Cryostat 4, Migration Toolkit for Applications 8, Multicluster Global Hub, OpenShift Serverless, Red Hat Advanced Cluster Management for Kubernetes 2, Red Hat Ceph Storage 5, … · no fix planned: Red Hat OpenShift Container Platform 4, Red Hat Ceph Storage 5, Red Hat Ceph Storage 6, Red Hat Ceph Storage 7, … · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-37236.json)","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}