Vulnerabilities > CVE-2021-43801 - Improper Check for Unusual or Exceptional Conditions vulnerability in Mercurius Project Mercurius 8.10.0/8.11.0/8.11.1
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
NONE Integrity impact
NONE Availability impact
HIGH Summary
Mercurius is a GraphQL adapter for Fastify. Any users from [email protected] to 8.11.1 are subjected to a denial of service attack by sending a malformed JSON to `/graphql` unless they are using a custom error handler. The vulnerability has been fixed in https://github.com/mercurius-js/mercurius/pull/678 and shipped as v8.11.2. As a workaround users may use a custom error handler.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| Application | 3 |