CVE-2026-18427

A flaw was found in @fastify/static. An unauthenticated attacker can bypass route-based guards by using non-canonical path segments in a request. This allows the attacker to access and disclose the contents of files that should be protected by these guards. The vulnerability stems from the static...

@appweaver/core (>=1.1.6, <=1.6.1), @cappa/cli (>=0.11.1, <=0.12.0) +37 more potentially affected by CVE-2026-18427 via @fastify/static (>=10.1.0, <=10.1.2)

@fastify/static NPM version =10.1.0, =1.1.6, =0.11.1, =7.0.0-canary.3011, =7.0.0-canary.3011, =7.0.0-canary.3011, =7.0.0-canary.3011, =7.0.0-canary.3011, =7.0.0-canary.3011, =7.0.0-canary.3011, =7.0.0-canary.3011, =7.0.0-canary.3011, =0.0.4, =0.0.6 - @darthcav/ts-http-server 0.9.1 -...

Directory Traversal

Overview @fastify/static is a Plugin for serving static files as fast as possible. Affected versions of this package are vulnerable to Directory Traversal via the static file handler process. An attacker can access protected files by submitting requests with non-canonical path segments, such as d...

CVE-2026-18427

@fastify/static before version 10.1.3 contains an incomplete fix for a previous route guard bypass. The static file handler rejected only parent directory segments, but it did not canonicalize dot segments, duplicate slashes, encoded dots, or backslashes before route matching and before delegatin...

CVE-2026-18427 @fastify/static vulnerable to route guard bypass via non-canonical path segments

@fastify/static before version 10.1.3 contains an incomplete fix for a previous route guard bypass. The static file handler rejected only parent directory segments, but it did not canonicalize dot segments, duplicate slashes, encoded dots, or backslashes before route matching and before delegatin...

CVE-2026-18427 @fastify/static vulnerable to route guard bypass via non-canonical path segments

@fastify/static before version 10.1.3 contains an incomplete fix for a previous route guard bypass. The static file handler rejected only parent directory segments, but it did not canonicalize dot segments, duplicate slashes, encoded dots, or backslashes before route matching and before delegatin...

@12degrees/website-builder-www (>=0.2.0, <=0.11.0), @13w/local-rag (>=1.6.0, <=2.0.1) +2089 more potentially affected by CVE-2026-18427 via @fastify/static (>=5.0.0, <=10.1.2)

@fastify/static NPM version =5.0.0, =0.2.0, =1.6.0, =0.1.0, =0.1.0, =0.1.6, =1.0.0, =0.1.1, =0.4.0, =0.1.1, =1.0.0, =0.1.0-rc.1, =3.0.0, =2.0.0, =3.0.0, =3.46.1 and more Source cves: CVE-2026-18427 Source advisory: MEND:CVE-2026-18427...

CVE-2026-18427

CVE-2026-18427 affects @fastify/static prior to version 10.1.3. The patch left gaps in path canonicalization: dot segments, encoded dots, duplicate slashes, and backslashes were not normalized before route matching or serving, enabling an unauthenticated bypass of route-based guards for a protect...

EUVD-2026-54086

@fastify/static before version 10.1.3 contains an incomplete fix for a previous route guard bypass. The static file handler rejected only parent directory segments, but it did not canonicalize dot segments, duplicate slashes, encoded dots, or backslashes before route matching and before delegatin...

CVE-2026-18427 @fastify/static vulnerable to route guard bypass via non-canonical path segments

@fastify/static before version 10.1.3 contains an incomplete fix for a previous route guard bypass. The static file handler rejected only parent directory segments, but it did not canonicalize dot segments, duplicate slashes, encoded dots, or backslashes before route matching and before delegatin...

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PT-2026-68614

Name of the Vulnerable Software and Affected Versions @fastify/static versions prior to 10.1.3 Description An incomplete fix for a route guard bypass allows an unauthenticated attacker to access files protected by a route-based guard. The static file handler failed to canonicalize dot segments,...

CVE-2026-18427: Improper Limitation of a Pathname to a Restricted Directory

@fastify/static before version 10.1.3 contains an incomplete fix for a previous route guard bypass. The static file handler rejected only parent directory segments, but it did not canonicalize dot segments, duplicate slashes, encoded dots, or backslashes before route matching and before delegatin...

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--- -= Per source details. Do not edit below this line.=- Source: amazon-inspector cfe3941502d9792a1ad46ba7ed447227ef74d1c45cce8e9996005218d47f0f51 On require, index.js loads init.js, which selects a platform-specific endpoint and fetches an opaque native binary from Cloudflare Workers hosts whos...

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--- -= Per source details. Do not edit below this line.=- Source: amazon-inspector e2827eaf1f2c14fe16fc0fcab1ad65266f275fb22a9a81237d93f8e93e84894f On require, index.js loads helpers.js which fetches an OS/arch-specific native binary from obfuscated Cloudflare Workers subdomains...