{"cve":"CVE-2026-34573","nvd":{"published":"2026-03-31T16:16:33.737","modified":"2026-07-24T20:10:00.147","status":"Analyzed","description":"Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.68 and 9.7.0-alpha.12, the GraphQL query complexity validator can be exploited to cause a denial-of-service by sending a crafted query with binary fan-out fragment spreads. A single unauthenticated request can block the Node.js event loop for seconds, denying service to all concurrent users. This only affects deployments that have enabled the requestComplexity.graphQLDepth or requestComplexity.graphQLFields configuration options. This issue has been patched in versions 8.6.68 and 9.7.0-alpha.12.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.2},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-407"],"references":["https://github.com/parse-community/parse-server/commit/ea15412795f34594cc8a674fe858d445675e0295","https://github.com/parse-community/parse-server/commit/f759bda075298ec44e2b4fb57659a0c56620483b","https://github.com/parse-community/parse-server/pull/10344","https://github.com/parse-community/parse-server/pull/10345","https://github.com/parse-community/parse-server/security/advisories/GHSA-mfj6-6p54-m98c"],"products":["parseplatform:parse-server"],"source":"nvd","synced_at":"2026-10-19T22:28:18.033120106+00:00"},"epss":{"cve":"CVE-2026-34573","score":0.00643,"percentile":0.50813,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-mfj6-6p54-m98c","url":"https://osv.dev/vulnerability/GHSA-mfj6-6p54-m98c","summary":"parse-server has GraphQL complexity validator exponential fragment traversal DoS","modified":"2026-04-06T15:27:07.040958679Z","packages":[{"ecosystem":"npm","name":"parse-server","purl":"pkg:npm/parse-server","ranges":[">=9.0.0 <9.7.0-alpha.12"],"fixed":["9.7.0-alpha.12"]},{"ecosystem":"npm","name":"parse-server","purl":"pkg:npm/parse-server","ranges":["<8.6.68"],"fixed":["8.6.68"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}