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2 vulnerabilities found for fastify-express by fastify

CVE-2026-22037 (GCVE-0-2026-22037)

Vulnerability from nvd – Published: 2026-01-19 16:48 – Updated: 2026-01-20 21:34
VLAI?
Title
@fastify/express vulnerable to Improper Handling of URL Encoding (Hex Encoding)
Summary
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.
Severity ?
8.4 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
CWE
  • CWE-177 - Improper Handling of URL Encoding (Hex Encoding)
  • CWE-288 - Authentication Bypass Using an Alternate Path or Channel
Assigner
References
Impacted products
Vendor Product Version
fastify fastify-express Affected: < 4.0.3
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CVE-2026-22037 (GCVE-0-2026-22037)

Vulnerability from cvelistv5 – Published: 2026-01-19 16:48 – Updated: 2026-01-20 21:34
VLAI?
Title
@fastify/express vulnerable to Improper Handling of URL Encoding (Hex Encoding)
Summary
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.
Severity ?
8.4 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
CWE
  • CWE-177 - Improper Handling of URL Encoding (Hex Encoding)
  • CWE-288 - Authentication Bypass Using an Alternate Path or Channel
Assigner
References
Impacted products
Vendor Product Version
fastify fastify-express Affected: < 4.0.3
Create a notification for this product.
Show details on NVD website
To clipboard 

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