Is this vulnerability remotely exploitable?

Yes. Any remote client that can establish a WebSocket connection to the Mercurius GraphQL endpoint and send subscription operations can attempt to exploit unbounded query depth, subject to whatever network and authentication controls are in place.

What level of access does an attacker need?

An attacker typically needs only the ability to open and maintain a WebSocket connection to the GraphQL server. If subscriptions are available to anonymous users or lightly authenticated clients, the barrier to exploitation is low.

What is the safest general fix pattern?

The safest pattern is to centralize and mandate query validation for all operation types and transports. Ensure that depth and complexity checks are applied consistently to queries, mutations, and subscriptions before execution, and that they cannot be accidentally bypassed in alternative code paths.

Severity:

HIGH RISK

(8.2)

Missing Authorization of Query Depth Checks (CWE-863) in Mercurius GraphQL Subscriptions

CVE-2026-30241

Published:

Mar 6, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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Vulnerability Type

Category:

Missing Authorization / Policy Enforcement

CWE:

CWE-863

Impact:

Denial of Service via Unbounded GraphQL Subscription Depth

Severity:

HIGH RISK

(8.2)

CVSS Version:

3.1

Vulnerability Type

Category:

Missing Authorization / Policy Enforcement

CWE:

CWE-863

Impact:

Denial of Service via Unbounded GraphQL Subscription Depth

Severity:

HIGH RISK

(8.2)

CVSS Version:

3.1

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Missing Authorization of Query Depth Checks (CWE-863) in Mercurius GraphQL Subscriptions

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.6)

Server-Side Request Forgery (CWE-918) in OpenClaw Zalo Plugin sendPhoto

HIGH RISK

HIGH

(8.8)

Authorization Bypass (CWE-863) in OpenClaw Matrix Room Control Commands

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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