CVE-2026-112712

@fastify/middie is the Express-style middleware engine for Fastify. In versions from 9.0.0 through 9.3.5, the use function joined a path-scoped middleware's mount path to the plugin scope prefix in a way that could diverge from the path Fastify's router serves, most often when the scope prefix...

CVE-2026-112712 @fastify/middie vulnerable to path-scoped middleware bypass via scope prefix mismatch

@fastify/middie is the Express-style middleware engine for Fastify. In versions from 9.0.0 through 9.3.5, the use function joined a path-scoped middleware's mount path to the plugin scope prefix in a way that could diverge from the path Fastify's router serves, most often when the scope prefix...

EUVD-2026-105361

@fastify/middie is the Express-style middleware engine for Fastify. In versions from 9.0.0 through 9.3.5, the use function joined a path-scoped middleware's mount path to the plugin scope prefix in a way that could diverge from the path Fastify's router serves, most often when the scope prefix...

CVE-2026-112712 @fastify/middie vulnerable to path-scoped middleware bypass via scope prefix mismatch

@fastify/middie is the Express-style middleware engine for Fastify. In versions from 9.0.0 through 9.3.5, the use function joined a path-scoped middleware's mount path to the plugin scope prefix in a way that could diverge from the path Fastify's router serves, most often when the scope prefix...

CVE-2026-112712

The @fastify/middie middleware engine for Fastify (versions 9.0.0 through 9.3.5 ) is vulnerable to a path-scoped middleware bypass . The use() function incorrectly joins mount paths with plugin scope prefixes, specifically when the prefix ends in a slash, contains array mount paths, or lacks a le...

@arenahito/droid-webscr (>=0.2.1, <=0.6.1), @cappa/cli (>=0.4.4, <=0.12.0) +3 more potentially affected by CVE-2026-85184 via @fastify/middie (>=9.1.0, <=9.3.3)

@fastify/middie NPM version =9.1.0, =0.2.1, =0.4.4, =0.2.8, =1.0.0, =1.0.0-alpha.23, =1.0.0-alpha.29 Source cves: CVE-2026-85184 Source advisory: SNYK:JS-FASTIFYMIDDIE-19643570...

Interpretation Conflict

Overview @fastify/middie is a Middleware engine for Fastify Affected versions of this package are vulnerable to Interpretation Conflict via the request target evaluation. An attacker can gain unauthorized access to protected routes by crafting requests with absolute-form targets that bypass...

CVE-2026-85184

@fastify/middie versions = 9.1.0 and before 9.3.4 decide whether to run path-scoped middleware by matching against the raw request target, while the Fastify router resolves an absolute-form request target to its path before dispatching. Because the two layers evaluate different strings, a request...

CVE-2026-85184 @fastify/middie vulnerable to path-scoped middleware bypass via absolute-form request target

@fastify/middie versions = 9.1.0 and before 9.3.4 decide whether to run path-scoped middleware by matching against the raw request target, while the Fastify router resolves an absolute-form request target to its path before dispatching. Because the two layers evaluate different strings, a request...

CVE-2026-85184

@fastify/middie (a Fastify plugin for HTTP middleware) versions 9.1.0 through 9.3.3 are affected by a path-scoped middleware bypass. The root cause is a mismatch: middie evaluates the raw request target to decide whether to run path-scoped middleware, while the Fastify router resolves an absolute...

EUVD-2026-70979

@fastify/middie versions = 9.1.0 and before 9.3.4 decide whether to run path-scoped middleware by matching against the raw request target, while the Fastify router resolves an absolute-form request target to its path before dispatching. Because the two layers evaluate different strings, a request...

CVE-2026-85184 @fastify/middie vulnerable to path-scoped middleware bypass via absolute-form request target

@fastify/middie versions = 9.1.0 and before 9.3.4 decide whether to run path-scoped middleware by matching against the raw request target, while the Fastify router resolves an absolute-form request target to its path before dispatching. Because the two layers evaluate different strings, a request...

@arenahito/droid-webscr (>=0.2.1, <=0.6.1), @cappa/cli (>=0.4.4, <=0.12.0) +3 more potentially affected by CVE-2026-85184 via @fastify/middie (>=9.1.0, <=9.3.3)

@fastify/middie NPM version =9.1.0, =0.2.1, =0.4.4, =0.2.8, =1.0.0, =1.0.0-alpha.23, =1.0.0-alpha.29 Source cves: CVE-2026-85184 Source advisory: MEND:CVE-2026-85184...

CVE-2026-85184 @fastify/middie vulnerable to path-scoped middleware bypass via absolute-form request target

@fastify/middie versions = 9.1.0 and before 9.3.4 decide whether to run path-scoped middleware by matching against the raw request target, while the Fastify router resolves an absolute-form request target to its path before dispatching. Because the two layers evaluate different strings, a request...

PT-2026-85452

Name of the Vulnerable Software and Affected Versions @fastify/middie versions 9.1.0 through 9.3.3 Description A mismatch occurs because the middleware evaluates the raw request target to determine if path-scoped middleware should run, whereas the Fastify router resolves an absolute-form request...

CVE-2026-85184: Interpretation Conflict

@fastify/middie versions = 9.1.0 and before 9.3.4 decide whether to run path-scoped middleware by matching against the raw request target, while the Fastify router resolves an absolute-form request target to its path before dispatching. Because the two layers evaluate different strings, a request...

@arenahito/droid-webscr (>=0.2.1, <=0.6.1), @cappa/cli (>=0.4.4, <=0.10.4) +2 more potentially affected by CVE-2026-14181 via @fastify/middie (>=9.1.0, <=9.3.2)

@fastify/middie NPM version =9.1.0, =0.2.1, =0.4.4, =0.2.8, =1.0.0-alpha.23, =1.0.0-alpha.28 Source cves: CVE-2026-14181 Source advisory: SNYK:JS-FASTIFYMIDDIE-17753355...

@arenahito/droid-webscr (>=0.2.1, <=0.6.1), @cappa/cli (>=0.4.4, <=0.10.4) +2 more potentially affected by CVE-2026-14198 via @fastify/middie (>=9.1.0, <=9.3.2)

@fastify/middie NPM version =9.1.0, =0.2.1, =0.4.4, =0.2.8, =1.0.0-alpha.23, =1.0.0-alpha.28 Source cves: CVE-2026-14198 Source advisory: SNYK:JS-FASTIFYMIDDIE-17753414...

Interpretation Conflict

Overview @fastify/middie is a Middleware engine for Fastify Affected versions of this package are vulnerable to Interpretation Conflict via the path parameter handling process. An attacker can gain unauthorized access to protected route handlers by sending a crafted URL containing an encoded slas...

CVE-2026-14198

@fastify/middie versions 9.1.0 through 9.3.2 decode the encoded slash %2F inside path parameter values before matching middleware paths, while Fastify's underlying router preserves the encoding during route lookup. The two layers disagree on the canonical request path, so the middleware fails to...