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CVE-2025-64166

5.4 · MEDIUM

Mercurius is a GraphQL adapter for Fastify.

Published Mar 5, 2026CWE-352EPSS 0.17%

Overview

CVE-2025-64166 is a medium-severity vulnerability. It was published on March 5, 2026 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Mercurius is a GraphQL adapter for Fastify. Prior to version 16.4.0, a cross-site request forgery (CSRF) vulnerability was identified. The issue arises from incorrect parsing of the Content-Type header in requests. Specifically, requests with Content-Type values such as application/x-www-form-urlencoded, multipart/form-data, or text/plain could be misinterpreted as application/json. This misinterpretation bypasses the preflight checks performed by the fetch() API, potentially allowing unauthorized actions to be performed on behalf of an authenticated user. This issue has been patched in version 16.4.0.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/mercurius-js/mercurius/commit/962d402ec7a92342f4a1b7f5f04af01776838c3cGitHubgithub.com/mercurius-js/mercurius/pull/1187GitHubgithub.com/mercurius-js/mercurius/security/advisories/GHSA-v66j-6wwf-jc57GitHubgithub.com/mercurius-js/mercurius/security/advisories/GHSA-v66j-6wwf-jc57

How CyberStrike helps

Frequently asked questions

What is CVE-2025-64166?

CVE-2025-64166 is a medium-severity vulnerability. It was published on March 5, 2026 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2025-64166?

This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-64166?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-64166?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-64166 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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