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CVE-2026-34573

Parse Server: GraphQL complexity validator exponential fragment traversal DoS

Published: Mar 31, 2026Updated: Apr 2, 2026 Sources: CVE List NVDCWE-407
7.5HIGH
NVD MITRE
EPSS Score
0.5%
Top 63.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-407

Affected Products

parse-serverparse-community
LibraryLibrary
OSS Libraries / npm
parse-serverparseplatform
LibraryLibrary
OSS Libraries / generic-library
parse-communityoss-projectOSS Librariesaka parse, parse server, parse-server
parseplatformoss-projectOSS Librariesaka parse platform

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/parse-community/parse-server/security/advisories/GHSA-mfj6-6p54-m98c
github.com
https://github.com/parse-community/parse-server/pull/10344
github.com
https://github.com/parse-community/parse-server/pull/10345
github.com
and 2 more references View all →

Timeline

Published
Mar 31, 2026
Last Updated
Apr 2, 2026

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