Inefficient Algorithmic Complexity Affecting parse-server package, versions <8.6.68>=9.0.0 <9.7.0-alpha.12
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-PARSESERVER-15864422
- published1 Apr 2026
- disclosed31 Mar 2026
- creditbugbunny-research
Introduced: 31 Mar 2026
NewCVE-2026-34573 (opens in a new tab)How to fix?
Upgrade parse-server to version 8.6.68, 9.7.0-alpha.12 or higher.
Overview
parse-server is a version of the Parse backend that can be deployed to any infrastructure that can run Node.js.
Affected versions of this package are vulnerable to Inefficient Algorithmic Complexity in the GraphQL query complexity validation process. An attacker can cause the Node.js event loop to become blocked for several seconds by sending a specially crafted query with binary fan-out fragment spreads, resulting in denial of service to all concurrent users. This is only exploitable if the requestComplexity.graphQLDepth or requestComplexity.graphQLFields configuration options are enabled.
Workaround
This vulnerability can be mitigated by disabling GraphQL complexity limits by setting requestComplexity.graphQLDepth and requestComplexity.graphQLFields to -1.