CVE-2026-34573

HIGH

Parse Server: GraphQL complexity validator exponential fragment traversal DoS

Title source: cna

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.

References (5)

Scores

CVSS v3 7.5
EPSS 0.0005
EPSS Percentile 15.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-407
Status published
Products (5)
npm/parse-server 9.0.0 - 9.7.0-alpha.12npm
parse-community/parse-server < 8.6.68
parse-community/parse-server >= 9.0.0, < 9.7.0-alpha.12
parseplatform/parse-server 9.7.0 alpha1 (11 CPE variants)
parseplatform/parse-server < 8.6.68
Published Mar 31, 2026
Tracked Since Mar 31, 2026