PT-2026-29277 · Parse Community · Parse Server

Published 2026-03-31 · Updated 2026-03-31 · CVE-2026-34573

NVD

CVSS v4.0

8.2

High

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

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.

Fix

Weakness Enumeration

CWE-407

Related Identifiers

CVE-2026-34573

Affected Products

Parse Server

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-34573 · Security Note
• https://github.com/parse-community/parse-server/security/advisories/GHSA-mfj6-6p54-m98c · Note
• https://github.com/parse-community/parse-server/commit/f759bda075298ec44e2b4fb57659a0c56620483b · Note
• https://github.com/parse-community/parse-server/pull/10344 · Note
• https://github.com/parse-community/parse-server/commit/ea15412795f34594cc8a674fe858d445675e0295 · Note
• https://github.com/parse-community/parse-server/pull/10345 · Note