{"id":"CVE-2026-47138","revision":"229979532bee4fa2b5e48ce765042ebd","records":[{"revision":"229979532bee4fa2b5e48ce765042ebd","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-47138","aliases":[],"title":"Parse Server: Pre-authentication denial of service via client version header regex backtracking","description":"Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.77 and 9.9.1-alpha.1, an unauthenticated attacker who knows a publicly-known Parse Application ID can submit a single HTTP request whose client SDK version field contains adversarial input that triggers polynomial backtracking in a request-header parser. The parsing runs before session authentication and before rate limiting on every /parse/* request, so the request consumes seconds to minutes of synchronous CPU on a Node.js worker before any access control evaluates it. A small number of concurrent requests can saturate a worker; a single large request via the body-field variant can pin a worker for minutes. Production deployments running the default configuration are affected. This issue has been patched in versions 8.6.77 and 9.9.1-alpha.1.","state":0,"publishedAt":"2026-06-12T18:22:02.751+00:00","modifiedAt":"2026-06-12T18:56:14.419+00:00","affected":[{"ecosystem":"Vendor product","name":"parse-server","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"parse-community\",\n                    \"product\": \"parse-server\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 8.6.77\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 9.0.0, < 9.9.1-alpha.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.7,"severity":"HIGH"}],"references":["https://github.com/parse-community/parse-server/security/advisories/GHSA-38m6-82c8-4xfm","https://github.com/parse-community/parse-server/pull/10463","https://github.com/parse-community/parse-server/pull/10464"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-47138","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-47138","identifiers":["CVE-2026-47138"]},"retained":false,"historicalAffected":[]}],"coverage":[]}