CVE-2025-64166
5.4 · MEDIUMOverview
CVE-2025-64166 is a medium-severity vulnerability affecting mercurius_project mercurius. 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 and patches from mercurius_project. Update mercurius to the latest patched version. 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.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| mercurius_project | mercurius | >= 0, < 16.4.0 | Affected |
References
Frequently Asked Questions
What is CVE-2025-64166?
CVE-2025-64166 is a medium-severity vulnerability affecting mercurius_project mercurius. 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 and patches from mercurius_project. Update mercurius to the latest patched version. 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's AI-powered security agents can automatically detect CVE-2025-64166 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
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