Description

Mercurius is a GraphQL adapter for Fastify. Prior to version 16.8.0, Mercurius fails to enforce the configured queryDepth limit on GraphQL subscription queries received over WebSocket connections. The depth check is correctly applied to HTTP queries and mutations, but subscription queries are parsed and executed without invoking the depth validation. This allows a remote client to submit arbitrarily deeply nested subscription queries over WebSocket, bypassing the intended depth restriction. On schemas with recursive types, this can lead to denial of service through exponential data resolution on each subscription event. This issue has been patched in version 16.8.0.

INFO

Published Date :

2026-03-06T21:15:33.433Z

Last Modified :

2026-03-09T20:54:28.446Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-30241 vulnerability.

Vendors Products
Mercurius-js
  • Mercurius
Mercurius Project
  • Mercurius
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-30241.

URL Resource
https://github.com/mercurius-js/mercurius/commit/5b56f60f4b0d60780b0ff499a479bd830bdd6986 cve-icon cve-icon
https://github.com/mercurius-js/mercurius/security/advisories/GHSA-m4h2-mjfm-mp55 cve-icon cve-icon
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CVSS Vulnerability Scoring System

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Detailed values of each vector for above chart.
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