Is CVE-2026-30241 actively exploited?

No active exploitation of CVE-2026-30241 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-30241 be exploited remotely?

Yes. CVE-2026-30241 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-30241?

CVE-2026-30241 has a CVSS score of 8.2 (HIGH).

HOME VULNERABILITIESCVE-2026-30241

HIGH

CVE-2026-30241

CWE-863Published: March 6, 2026· Updated: Mar 12, 2026

8.2

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:2.1th

Official 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.

NVD Source

Technical Analysis

CVE-2026-30241 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 8.2.