{"id":"GHSA-38m6-82c8-4xfm","revision":null,"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":[]},{"revision":"3859e5accfd94bcc8797af0ae77605c7","observedAt":"2026-11-07T10:39:49.876+00:00","statement":{"source":"euvd","id":"EUVD-2026-36535","aliases":["CVE-2026-47138","GHSA-38m6-82c8-4xfm"],"title":"Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. 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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":"2026-06-12T19:16:28.257+00:00","modifiedAt":"2026-10-26T11:10:00.157+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","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/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","score":8.7,"severity":"HIGH"}],"references":["https://github.com/parse-community/parse-server/pull/10463","https://github.com/parse-community/parse-server/pull/10464","https://github.com/parse-community/parse-server/security/advisories/GHSA-38m6-82c8-4xfm"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-47138","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-1333"],"productCriteria":[],"sourceDates":{"published":"2026-06-12T19:16:28.257","lastModified":"2026-10-26T11:10:00.157"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. 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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.\n\n### Patches\n\nThe client SDK version capture and parsing have been removed entirely. The Parse JS SDK compatibility table defines a strict version-pinned contract between Parse Server and the Parse JS SDK; server-side adaptation to client SDK version is an obsolete pattern that contradicts that contract. The vulnerable parser, the `clientSDK` parameter that threaded its output through routers, and the legacy code path it gated are all removed. The `X-Parse-Client-Version` header and `_ClientVersion` JSON body field are now silently ignored on every request; supported Parse SDKs are unaffected.\n\n### Workarounds\n\nDeploy a reverse proxy or WAF in front of Parse Server that strips or strictly size-limits the `X-Parse-Client-Version` header AND the `_ClientVersion` field in JSON request bodies on every `/parse/*` route before forwarding to the server. A header-size cap alone is insufficient: the body-field variant requires inspection of JSON content. Upgrading to the patched version is the recommended remediation.","state":0,"publishedAt":"2026-05-23T00:11:25+00:00","modifiedAt":"2026-06-16T13:26:25.3209587+00:00","affected":[{"ecosystem":"npm","name":"parse-server","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"9.0.0"},{"kind":"fixed","version":"9.9.1-alpha.1"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"parse-server","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"8.6.77"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","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":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/parse-community/parse-server/security/advisories/GHSA-38m6-82c8-4xfm","https://nvd.nist.gov/vuln/detail/CVE-2026-47138","https://github.com/parse-community/parse-server/pull/10463","https://github.com/parse-community/parse-server/pull/10464","https://github.com/parse-community/parse-server"],"sourceUrl":"https://github.com/advisories/GHSA-38m6-82c8-4xfm","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-38m6-82c8-4xfm","identifiers":["GHSA-38m6-82c8-4xfm","BIT-parse-2026-47138","CVE-2026-47138"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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