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...

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 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...

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

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...

GHSA-8PVW-JCV7-9CMJ @fastify/static vulnerable to Authorization Bypass via Non-Canonical URL Paths

Impact @fastify/static evaluates the allowedPath callback before normalizing dot segments and duplicate slashes in the pathname used for file resolution. Non-canonical pathnames such as //file, /./file, or /public/../private/file bypass allowedPath filtering while resolving to the intended file o...

EUVD-2026-47870

@fastify/static vulnerable to Authorization Bypass via Non-Canonical URL Paths...

EUVD-2026-47871

@fastify/static vulnerable to route guard bypass via path traversal...

Incorrect Behavior Order: Validate Before Canonicalize

Overview @fastify/static is a Plugin for serving static files as fast as possible. Affected versions of this package are vulnerable to Incorrect Behavior Order: Validate Before Canonicalize via non-canonical URL path handling in the allowedPath check in index.js. An attacker can bypass file/subtr...

CVE-2026-7120

@fastify/static evaluates the allowedPath callback before normalizing dot segments and duplicate path separators in the pathname used for file resolution. Versions up to and including 10.1.1 are affected. An unauthenticated attacker can bypass allowedPath restrictions by requesting equivalent...

CVE-2026-15074

@fastify/static up to and including version 10.1.0 fails to reject dot-dot path segments in request pathnames before the file-resolution stage. This is a bypass of the earlier fix for CVE-2026-6414, which only covered encoded forward slashes. Because the underlying send library normalizes dot...

CVE-2026-15074

The CVE-2026-15074 issue affects @fastify/static up to and including version 10.1.0, which fails to reject dot-dot path segments in request pathnames before file resolution. This bypasses the earlier fix for CVE-2026-6414 (encoded slashes only) because the underlying send library normalizes dot s...

CVE-2026-15074 @fastify/static vulnerable to route guard bypass via path traversal

@fastify/static up to and including version 10.1.0 fails to reject dot-dot path segments in request pathnames before the file-resolution stage. This is a bypass of the earlier fix for CVE-2026-6414, which only covered encoded forward slashes. Because the underlying send library normalizes dot...

CVE-2026-15074 @fastify/static vulnerable to route guard bypass via path traversal

@fastify/static up to and including version 10.1.0 fails to reject dot-dot path segments in request pathnames before the file-resolution stage. This is a bypass of the earlier fix for CVE-2026-6414, which only covered encoded forward slashes. Because the underlying send library normalizes dot...

CVE-2026-7120 @fastify/static vulnerable to Authorization Bypass via Non-Canonical URL Paths

@fastify/static evaluates the allowedPath callback before normalizing dot segments and duplicate path separators in the pathname used for file resolution. Versions up to and including 10.1.1 are affected. An unauthenticated attacker can bypass allowedPath restrictions by requesting equivalent...

CVE-2026-7120

@fastify/static evaluates the allowedPath callback before normalizing dot segments and duplicate path separators in the pathname used for file resolution. Versions up to and including 10.1.1 are affected. An unauthenticated attacker can bypass allowedPath restrictions by requesting equivalent...

CVE-2026-7120 @fastify/static vulnerable to Authorization Bypass via Non-Canonical URL Paths

@fastify/static evaluates the allowedPath callback before normalizing dot segments and duplicate path separators in the pathname used for file resolution. Versions up to and including 10.1.1 are affected. An unauthenticated attacker can bypass allowedPath restrictions by requesting equivalent...

CVE-2026-7120

The CVE-2026-7120 issue affects @fastify/static (versions up to and including 10.1.1). The root cause is that allowedPath is evaluated before normalizing dot segments and duplicate separators in the request pathname, allowing an unauthenticated attacker to bypass path-based filtering by using equ...

CVE-2026-7120 @fastify/static vulnerable to Authorization Bypass via Non-Canonical URL Paths

@fastify/static evaluates the allowedPath callback before normalizing dot segments and duplicate path separators in the pathname used for file resolution. Versions up to and including 10.1.1 are affected. An unauthenticated attacker can bypass allowedPath restrictions by requesting equivalent...

PT-2026-63566

Name of the Vulnerable Software and Affected Versions @fastify/static versions prior to 10.1.1 Description An unauthenticated attacker can bypass route-scoped middleware and guards by using non-leading .. and %2E%2E path segments in request pathnames. This occurs because the find-my-way router do...