{"id":"BIT-parse-2026-47138","summary":"Parse Server: Pre-authentication denial of service via client version header regex backtracking","details":"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, 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.","aliases":["CVE-2026-47138","GHSA-38m6-82c8-4xfm"],"modified":"2026-06-16T13:26:25.320958741Z","published":"2026-06-16T12:40:05.150Z","database_specific":{"cpes":["cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:*"],"severity":"High"},"references":[{"type":"WEB","url":"https://github.com/parse-community/parse-server/pull/10463"},{"type":"WEB","url":"https://github.com/parse-community/parse-server/pull/10464"},{"type":"WEB","url":"https://github.com/parse-community/parse-server/security/advisories/GHSA-38m6-82c8-4xfm"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47138"}],"affected":[{"package":{"name":"parse","ecosystem":"Bitnami","purl":"pkg:bitnami/parse"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"8.6.77"},{"introduced":"9.0.0"},{"fixed":"9.9.1"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/parse/BIT-parse-2026-47138.json"},"severity":[{"type":"CVSS_V4","score":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}],"schema_version":"1.7.5"}