Node.js CVE-2026-22037
HIGH
GHSA-g6q3-96cp-5r5m
Severity by source
AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
Lifecycle Timeline
3DescriptionGitHub Advisory
The @fastify/express plugin adds full Express compatibility to Fastify. A security vulnerability exists in @fastify/express prior to version 4.0.3 where middleware registered with a specific path prefix can be bypassed using URL-encoded characters (e.g., /%61dmin instead of /admin). While the middleware engine fails to match the encoded path and skips execution, the underlying Fastify router correctly decodes the path and matches the route handler, allowing attackers to access protected endpoints without the middleware constraints. The vulnerability is caused by how @fastify/express matches requests against registered middleware paths. This vulnerability is similar to, but differs from, CVE-2026-22031 because this is a different npm module with its own code. Version 4.0.3 of @fastify/express contains a patch fort the issue.
AnalysisAI
The @fastify/express plugin prior to version 4.0.3 allows authenticated attackers to bypass path-based middleware restrictions by submitting URL-encoded characters in requests, such as using /%61dmin instead of /admin. While the middleware engine fails to match the encoded path, the underlying Fastify router correctly decodes it and routes the request to handlers, enabling unauthorized access to protected endpoints. This affects Node.js applications using vulnerable versions of the plugin.
Technical ContextAI
Affects fastify/expre. The @fastify/express plugin adds full Express compatibility to Fastify. A security vulnerability exists in @fastify/express prior to version 4.0.3 where middleware registered with a specific path prefix can be bypassed using URL-encoded characters (e.g., /%61dmin instead of /admin). While the middleware engine fails to match the encoded path and skips execution, the underlying Fastify router correctly decodes the path and matches the route handler, allowing attackers to access protected endp
Affected ProductsAI
Product: fastify/expre. Versions: up to 4.0.3.
RemediationAI
Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.
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