CVE-2026-6414— @fastify/static vulnerable to route guard bypass via encoded path separators
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I. Basic Information for CVE-2026-6414
Vulnerability Information
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Vulnerability Title
@fastify/static vulnerable to route guard bypass via encoded path separators
Source: NVD (National Vulnerability Database)
Vulnerability Description
@fastify/static versions 8.0.0 through 9.1.0 decode percent-encoded path separators (%2F) before filesystem resolution, while Fastify's router treats them as literal characters. This mismatch allows attackers to bypass route-based middleware or guards that protect files served by @fastify/static. For example, a route guard on a protected path can be circumvented by encoding the path separator in the URL. Upgrade to @fastify/static 9.1.1 to fix this issue. There are no workarounds.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
URL编码处理不恰当(Hex编码)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Fastify-Static 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fastify-Static是Fastify开源的一个插件。用于尽快提供静态文件。 Fastify-Static 8.0.0至9.1.0版本存在安全漏洞，该漏洞源于解码百分号编码的路径分隔符，可能导致绕过基于路由的中间件或防护。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| @fastify/static | @fastify/static | 8.0.0 ~ 9.1.1 | - |
II. Public POCs for CVE-2026-6414
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|---|
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IV. Related Vulnerabilities
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