CVE-2026-33804 @fastify/middie vulnerable to middleware bypass via deprecated ignoreDuplicateSlashes option

@fastify/middie versions 9.3.1 and earlier are vulnerable to middleware bypass when the deprecated Fastify ignoreDuplicateSlashes option is enabled. The middleware path matching logic does not account for duplicate slash normalization performed by Fastify's router, allowing requests with duplicat...

CVE-2026-33804

CVE-2026-33804 affects @fastify/middie v9.3.1 and earlier, where middleware bypass can occur when the deprecated top-level ignoreDuplicateSlashes option is enabled. The middleware’s path-matching does not account for duplicate-slash normalization performed by Fastify’s router, allowing requests w...

CVE-2026-33804 @fastify/middie vulnerable to middleware bypass via deprecated ignoreDuplicateSlashes option

@fastify/middie versions 9.3.1 and earlier are vulnerable to middleware bypass when the deprecated Fastify ignoreDuplicateSlashes option is enabled. The middleware path matching logic does not account for duplicate slash normalization performed by Fastify's router, allowing requests with duplicat...

CVE-2026-33804 @fastify/middie vulnerable to middleware bypass via deprecated ignoreDuplicateSlashes option

@fastify/middie versions 9.3.1 and earlier are vulnerable to middleware bypass when the deprecated Fastify ignoreDuplicateSlashes option is enabled. The middleware path matching logic does not account for duplicate slash normalization performed by Fastify's router, allowing requests with duplicat...

CVE-2026-6270 @fastify/middie vulnerable to middleware authentication bypass in child plugin scopes

@fastify/middie versions 9.3.1 and earlier do not register inherited middleware directly on child plugin engine instances. When a Fastify application registers authentication middleware in a parent scope and then registers child plugins with @fastify/middie, the child scope does not inherit the...

CVE-2026-6270

@fastify/middie versions 9.3.1 and earlier do not register inherited middleware directly on child plugin engine instances. When a Fastify application registers authentication middleware in a parent scope and then registers child plugins with @fastify/middie, the child scope does not inherit the...

CVE-2026-6270

Summary : The vulnerability affects the Node.js module @fastify/middie, specifically versions 9.3.1 and earlier. The root cause is that inherited middleware is not registered on child plugin engine instances, so when a Fastify app registers authentication middleware in a parent scope and then loa...

CVE-2026-6270 @fastify/middie vulnerable to middleware authentication bypass in child plugin scopes

@fastify/middie versions 9.3.1 and earlier do not register inherited middleware directly on child plugin engine instances. When a Fastify application registers authentication middleware in a parent scope and then registers child plugins with @fastify/middie, the child scope does not inherit the...

CVE-2026-6270 @fastify/middie vulnerable to middleware authentication bypass in child plugin scopes

@fastify/middie versions 9.3.1 and earlier do not register inherited middleware directly on child plugin engine instances. When a Fastify application registers authentication middleware in a parent scope and then registers child plugins with @fastify/middie, the child scope does not inherit the...

PT-2026-33323

Name of the Vulnerable Software and Affected Versions @fastify/middie versions prior to 9.3.2 Description A middleware bypass exists when the deprecated ignoreDuplicateSlashes option is enabled. The middleware path matching logic fails to account for duplicate slash normalization performed by the...

@fastify/middie 安全漏洞

@fastify/middie is an open-source middleware engine developed by Fastify. Versions of @fastify/middie prior to 9.3.1 contained security vulnerabilities. These vulnerabilities stemmed from the lack of registration of inherited middleware on sub-plugin engine instances, which could lead to bypassin...

@fastify/middie 安全漏洞

@fastify/middie is an open-source middleware engine developed by Fastify. Versions of @fastify/middie 9.3.1 and earlier contained security vulnerabilities. These vulnerabilities occurred when the deprecated ignoreDuplicateSlashes option was enabled, as the middleware’s path matching logic did not...

PT-2026-33320

Name of the Vulnerable Software and Affected Versions @fastify/middie versions prior to 9.3.2 Description Inherited middleware is not registered directly on child plugin engine instances. When authentication middleware is registered in a parent scope and child plugins are registered with...

CVE-2026-33804: Interpretation Conflict

@fastify/middie versions 9.3.1 and earlier are vulnerable to middleware bypass when the deprecated Fastify ignoreDuplicateSlashes option is enabled. The middleware path matching logic does not account for duplicate slash normalization performed by Fastify's router, allowing requests with duplicat...

CVE-2026-6270: Interpretation Conflict

@fastify/middie versions 9.3.1 and earlier do not register inherited middleware directly on child plugin engine instances. When a Fastify application registers authentication middleware in a parent scope and then registers child plugins with @fastify/middie, the child scope does not inherit the...

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...

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

Summary A path normalization inconsistency in @fastify/middie 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...

@bechara/crux (>=6.0.0-alpha.1, <=6.6.2), @cappa/cli (>=0.1.0, <=0.7.1) +11 more potentially affected by CVE-2026-2880 via @fastify/middie (>=9.0.2, <=9.1.0)

@fastify/middie NPM version =9.0.2, =6.0.0-alpha.1, =0.1.0, =0.1.0, =1.0.0-develop-pedago.0, =1.0.11, =0.1.51, =1.0.36, =11.0.0-next.1, =1.3.0, =5.0.0-beta.36, =0.6.1-dev, =1.1.95 Source cves: CVE-2026-2880 Source advisory: GHSA-8P85-9QPW-FWGW...

@bechara/crux (>=6.0.0-alpha.1, <=6.6.2), @cappa/cli (>=0.1.0, <=0.7.1) +11 more potentially affected by CVE-2026-2880 via @fastify/middie (>=9.0.2, <=9.1.0)

@fastify/middie NPM version =9.0.2, =6.0.0-alpha.1, =0.1.0, =0.1.0, =1.0.0-develop-pedago.0, =1.0.11, =0.1.51, =1.0.36, =11.0.0-next.1, =1.3.0, =5.0.0-beta.36, =0.6.1-dev, =1.1.95 Source cves: CVE-2026-2880 Source advisory: OSV:GHSA-8P85-9QPW-FWGW...

GHSA-8P85-9QPW-FWGW @fastify/middie has Improper Path Normalization when Using Path-Scoped Middleware

Summary A path normalization inconsistency in @fastify/middie 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...