Description
@fastify/middie is the plugin that adds middleware support on steroids to Fastify. A security vulnerability exists in @fastify/middie prior to version 9.1.0 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. Version 9.1.0 fixes the issue.
INFO
Published Date :
2026-01-19T15:24:45.899Z
Last Modified :
2026-01-20T14:45:31.487Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-22031 vulnerability.
| Vendors | Products |
|---|---|
| Fastify |
|
| Openjsf |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-22031.
