CVE-2025-64166

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.

• CWE-352

• https://github.com/mercurius-js/mercurius/commit/962d402ec7a92342f4a1b7f5f04af01776838c3cPatch
• https://github.com/mercurius-js/mercurius/pull/1187Issue Tracking, Patch
• https://github.com/mercurius-js/mercurius/security/advisories/GHSA-v66j-6wwf-jc57Exploit, Patch, Vendor Advisory
• https://github.com/mercurius-js/mercurius/security/advisories/GHSA-v66j-6wwf-jc57Exploit, Patch, Vendor Advisory

Published

Mar 5, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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