CVE-2026-33808 @fastify/express vulnerable to middleware authentication bypass via URL normalization gaps (duplicate slashes and semicolons)

Impact@fastify/express v4.0.4 and earlier fails to normalize URLs before passing them to Express middleware when Fastify router normalization options are enabled. This allows complete bypass of path-scoped authentication middleware via duplicate slashes when ignoreDuplicateSlashes is enabled, or...

CVE-2026-33808 @fastify/express vulnerable to middleware authentication bypass via URL normalization gaps (duplicate slashes and semicolons)

Impact@fastify/express v4.0.4 and earlier fails to normalize URLs before passing them to Express middleware when Fastify router normalization options are enabled. This allows complete bypass of path-scoped authentication middleware via duplicate slashes when ignoreDuplicateSlashes is enabled, or...

@fastify/express 安全漏洞

@fastify/express is a compatibility plugin developed by Fastify. Versions of @fastify/express 4.0.4 and earlier contain security vulnerabilities. These vulnerabilities arise from failing to normalize URLs before passing them to Express middleware when the Fastify router normalization option is...

CVE-2026-2880

A vulnerability in @fastify/middie versions 9.2.0 can result in authentication/authorization bypass when using path-scoped middleware for example, app.use'/secret', auth. When Fastify router normalization options are enabled such as ignoreDuplicateSlashes, useSemicolonDelimiter, and related...

EUVD-2026-9049

@fastify/middie has Improper Path Normalization when Using Path-Scoped Middleware...

CVE-2026-2880

A vulnerability in @fastify/middie versions 9.2.0 can result in authentication/authorization bypass when using path-scoped middleware for example, app.use'/secret', auth. When Fastify router normalization options are enabled such as ignoreDuplicateSlashes, useSemicolonDelimiter, and related...

CVE-2026-2880

A vulnerability in @fastify/middie versions 9.2.0 can result in authentication/authorization bypass when using path-scoped middleware for example, app.use'/secret', auth. When Fastify router normalization options are enabled such as ignoreDuplicateSlashes, useSemicolonDelimiter, and related...

CVE-2026-2880 @fastify/middie has an improper path normalization vulnerability

A vulnerability in @fastify/middie versions 9.2.0 can result in authentication/authorization bypass when using path-scoped middleware for example, app.use'/secret', auth. When Fastify router normalization options are enabled such as ignoreDuplicateSlashes, useSemicolonDelimiter, and related...

CVE-2026-2880: Improper Input Validation

A vulnerability in @fastify/middie versions 9.2.0 can result in authentication/authorization bypass when using path-scoped middleware for example, app.use'/secret', auth. When Fastify router normalization options are enabled such as ignoreDuplicateSlashes, useSemicolonDelimiter, and related...

PT-2026-22377

Name of the Vulnerable Software and Affected Versions @fastify/middie versions prior to 9.2.0 Description A flaw exists in @fastify/middie that can lead to authentication or authorization bypass when path-scoped middleware is used, such as with app.use'/secret', auth. This occurs when Fastify...

@fastify/middie 安全漏洞

@fastify/middie is an open-source middleware engine developed by Fastify. Versions of @fastify/middie prior to 9.2.0 contained security vulnerabilities. These vulnerabilities stemmed from the possibility of bypassing the path range middleware when using router normalization options, which could...