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CVE-2026-22031

🔴 HIGH

@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...

Published
Jan 19, 2026
Last Modified
Jan 26, 2026
Views
13
Bookmarks
0

Description

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@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.

CVSS Scores

CVSS 3.1 8.4
8.4
HIGH
CVSS 2.0 8.4

References

github.com github.com github.com github.com

Additional Information

Source
security-advisories@github.com
State
Awaiting analysis

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