Vulnerability · Published Mar 31, 2026 · Assigned by GitHub_M
CVE-2026-34573Parse Server: GraphQL complexity validator exponential fragment traversal DoS
High 8.2
In plain English
A high-severity security flaw in parse-server from parse-community. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | parse-server | 9.7.0-alpha.12 | GHSA-mfj6-6p54-m98c |
| npm | parse-server | 8.6.68 | GHSA-mfj6-6p54-m98c |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| parse-community | parse-server | < 8.6.68>= 9.0.0, < 9.7.0-alpha.12 |
Weakness: CWE-407 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References
- https://github.com/parse-community/parse-server/security/advisories/GHSA-mfj6-6p54-m98c x_refsource_CONFIRM
- https://github.com/parse-community/parse-server/pull/10344 x_refsource_MISC
- https://github.com/parse-community/parse-server/pull/10345 x_refsource_MISC
- https://github.com/parse-community/parse-server/commit/ea15412795f34594cc8a674fe858d445675e0295 x_refsource_MISC
- https://github.com/parse-community/parse-server/commit/f759bda075298ec44e2b4fb57659a0c56620483b x_refsource_MISC