Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-34573

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 16.1%
CVSS Severity
CVSS v3 Score 7.5
Products affected by CVE-2026-34573


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