CVE-2026-34573
HIGHParse Server: GraphQL complexity validator exponential fragment traversal DoS
Title source: cnaDescription
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)
Core 5
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/parse-community/parse-server/security/advisories/GHSA-mfj6-6p54-m98c
X_Refsource_Misc x_refsource_misc
https://github.com/parse-community/parse-server/pull/10344
X_Refsource_Misc x_refsource_misc
https://github.com/parse-community/parse-server/pull/10345
X_Refsource_Misc x_refsource_misc
https://github.com/parse-community/parse-server/commit/ea15412795f34594cc8a674fe858d445675e0295
X_Refsource_Misc x_refsource_misc
https://github.com/parse-community/parse-server/commit/f759bda075298ec44e2b4fb57659a0c56620483b
Scores
CVSS v3
7.5
EPSS
0.0046
EPSS Percentile
36.4%
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