{"id":"CVE-2026-37236","details":"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-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.","modified":"2026-09-03T10:10:55.913022331Z","published":"2026-08-28T00:00:00Z","related":["openSUSE-SU-2026:11667-1","openSUSE-SU-2026:11669-1","openSUSE-SU-2026:11676-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/37xxx/CVE-2026-37236.json","cna_assigner":"mitre"},"references":[{"type":"WEB","url":"https://s00me00ne.com/cve/cve-2026-37236/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/37xxx/CVE-2026-37236.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-37236"},{"type":"FIX","url":"https://github.com/grpc-ecosystem/grpc-gateway/commit/72123cd4f32545f6e1376873f412dcdcbcf29acc"},{"type":"PACKAGE","url":"https://github.com/grpc-ecosystem/grpc-gateway"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/grpc-ecosystem/grpc-gateway","events":[{"introduced":"0"},{"fixed":"72123cd4f32545f6e1376873f412dcdcbcf29acc"}],"database_specific":{"source":"REFERENCES"}}],"versions":["v2.28.0","v2.27.8","v2.27.7","v2.26.7","v2.27.6","v2.27.5","v2.27.4","v2.27.3","v2.27.2","v2.27.1","v2.27.0","v2.26.3","v2.26.2","v2.26.1","v2.26.0","v2.25.1","v2.25.0","v2.24.0","v2.23.0","v2.22.0","v2.21.0","v2.20.0","v2.19.1","v2.19.0","v2.18.1","v2.18.0","v2.17.1","v2.17.0","v2.16.2","v2.16.1","v2.16.0","v2.15.2","v2.15.1","v2.15.0","v2.14.0","v2.13.0","v2.12.0","v2.11.3","v2.11.2","v2.11.1","v2.11.0","v2.10.3","v2.10.2","v2.10.1","v2.10.0","v2.9.0","v2.8.0","v2.7.3","v2.7.2","v2.7.1","v2.7.0","v2.6.0","v2.5.0","v2.4.0","v2.3.0","v2.2.0","v2.1.0","v2.0.1","v2.0.0","v1.15.2","v1.15.1","v1.15.0","v1.14.8","v1.14.7","v2.0.0-beta.2","v1.14.6","v1.14.5","v2.0.0-alpha.1","v1.14.4","v1.14.3","v1.14.2","v1.14.1","v1.14.0","v1.13.0","v1.12.2","v1.12.1","v1.12.0","v1.11.3","v1.11.2","v1.11.1","v1.11.0","v1.10.0","v1.9.6","v1.9.5","v1.9.4","v1.9.3","v1.9.2","v1.9.1","v1.9.0","v1.8.6","v1.8.5","v1.8.4","v1.8.3","v1.8.2","v1.8.1","v1.8.1-pre1","v1.8.0","v1.7.0","v1.6.4","v1.6.3","v1.6.2","v1.5.1","v1.5.0","v1.4.1","v1.4.0","v1.3.0","v1.3","v1.2.2","v1.2.1","v1.2.0","v1.2.0.rc1","v1.1.0","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-37236.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}