Fastify Middie Middleware Path Bypass

Summary A security vulnerability exists in @fastify/middie 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...

GHSA-CXRG-G7R8-W69P Fastify Middie Middleware Path Bypass

Summary A security vulnerability exists in @fastify/middie 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...

CVE-2026-22031

@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...

PT-2026-33313

Name of the Vulnerable Software and Affected Versions @fastify/static versions 8.0.0 through 9.1.0 Description @fastify/static decodes percent-encoded path separators '%2F' before filesystem resolution, whereas the Fastify router treats them as literal characters. This discrepancy allows for a...

Improper Handling of URL Encoding (Hex Encoding)

Overview @fastify/express is an Express compatibility layer for Fastify Affected versions of this package are vulnerable to Improper Handling of URL Encoding Hex Encoding where middleware registered with a specific path prefix can be bypassed using URL-encoded characters e.g., /%61dmin instead of...

CVE-2026-22037

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...

CVE-2026-22037 @fastify/express vulnerable to Improper Handling of URL Encoding (Hex Encoding)

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...

CVE-2026-22037

The vulnerability affects the @fastify/express plugin (prior to version 4.0.3). Middleware registered for a specific path prefix can be bypassed when the request uses URL-encoded characters (e.g., /%61dmin instead of /admin). The middleware engine fails to match the encoded path, but the underlyi...

CVE-2026-22037 @fastify/express vulnerable to Improper Handling of URL Encoding (Hex Encoding)

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...

CVE-2026-22037

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...

CVE-2026-22037 @fastify/express vulnerable to Improper Handling of URL Encoding (Hex Encoding)

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...

CVE-2026-22031

@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...

@bechara/crux (>=6.0.0 <=6.6.2), @cappa/cli (>=0.1.0 <=0.4.3) +10 more potentially affected by CVE-2026-22031 via @fastify/middie (>=9.0.2 <=9.0.3)

@fastify/middie NPM version =9.0.2, =6.0.0, =0.1.0, =0.1.0, =1.0.0, =1.0.11, =0.1.51, =1.0.36, =11.0.0, =1.3.0, =5.0.0, =0.6.1-dev, =1.1.48 Source cves: CVE-2026-22031 Source advisory: SNYK:JS-FASTIFYMIDDIE-15038725...

Improper Handling of URL Encoding (Hex Encoding)

Overview @fastify/middie is a Middleware engine for Fastify Affected versions of this package are vulnerable to Improper Handling of URL Encoding Hex Encoding where middleware registered with a specific path prefix can be bypassed using URL-encoded characters e.g., /%61dmin instead of /admin. An...

CVE-2026-22031 Fastify Middie Middleware Path Bypass

@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...

CVE-2026-22031

CVE-2026-22031 affects the Fastify middleware plugin @fastify/middie (prior to 9.1.0). A vulnerability allows bypassing a middleware registered with a path prefix by using URL-encoded paths (e.g., /%61dmin). The middie engine uses path-to-regexp for matching; the regex is applied to the undecoded...

CVE-2026-22031 Fastify Middie Middleware Path Bypass

@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...

CVE-2026-22031

@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...

CVE-2026-22031 Fastify Middie Middleware Path Bypass

@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...

PT-2026-3448

Name of the Vulnerable Software and Affected Versions @fastify/middie versions prior to 9.1.0 Description A security issue exists in @fastify/middie where middleware registered with a specific path prefix can be bypassed using URL-encoded characters. For example, using /%61dmin instead of /admin...