CVE-2026-34573
CVE-2026-34573 · Parse Server: GraphQL complexity validator exponential fragment traversal DoS
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 8.2 · High · EPSS 0.6% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
parse-server
- Versions
- < 8.6.68: Affected
- >= 9.0.0, < 9.7.0-alpha.12: Affected
No fix published
parse-server npm
- Affected ranges
- SEMVER: ≥ 9.0.0, < 9.7.0-alpha.12
Update to 9.7.0-alpha.12
parse-server npm
- Affected ranges
- SEMVER: < 8.6.68
Update to 8.6.68
Original sources
- https://github.com/parse-community/parse-server/security/advisories/GHSA-mfj6-6p54-m98c
- https://github.com/parse-community/parse-server/pull/10344
- https://github.com/parse-community/parse-server/pull/10345
- https://github.com/parse-community/parse-server/commit/ea15412795f34594cc8a674fe858d445675e0295
- https://github.com/parse-community/parse-server/commit/f759bda075298ec44e2b4fb57659a0c56620483b
- https://nvd.nist.gov/vuln/detail/CVE-2026-34573