CVE-2026-34573
Parse Server: GraphQL complexity validator exponential fragment traversal DoS
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.
INFO
Published Date :
March 31, 2026, 4:16 p.m.
Last Modified :
April 2, 2026, 5:31 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Parse Server to version 8.6.68 or later.
- Update Parse Server to version 9.7.0-alpha.12 or later.
- Ensure requestComplexity configurations are reviewed.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-34573.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34573 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-34573
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-34573 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-34573 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 02, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* versions from (including) 9.0.0 up to (excluding) 9.7.0 *cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha1:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha10:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha11:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha2:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha3:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha4:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha5:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha6:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha7:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha8:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha9:*:*:*:node.js:*:* *cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* versions up to (excluding) 8.6.68 Added Reference Type GitHub, Inc.: https://github.com/parse-community/parse-server/commit/ea15412795f34594cc8a674fe858d445675e0295 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/parse-community/parse-server/commit/f759bda075298ec44e2b4fb57659a0c56620483b Types: Patch Added Reference Type GitHub, Inc.: https://github.com/parse-community/parse-server/pull/10344 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/parse-community/parse-server/pull/10345 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/parse-community/parse-server/security/advisories/GHSA-mfj6-6p54-m98c Types: Patch, Vendor Advisory -
New CVE Received by [email protected]
Mar. 31, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-407 Added Reference https://github.com/parse-community/parse-server/commit/ea15412795f34594cc8a674fe858d445675e0295 Added Reference https://github.com/parse-community/parse-server/commit/f759bda075298ec44e2b4fb57659a0c56620483b Added Reference https://github.com/parse-community/parse-server/pull/10344 Added Reference https://github.com/parse-community/parse-server/pull/10345 Added Reference https://github.com/parse-community/parse-server/security/advisories/GHSA-mfj6-6p54-m98c