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

Quick assessment

Affected
@fastify/static @fastify/static
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fastify static是Fastify组织的一个威胁情报网络辅助工具。 Fastify static 10.1.0及之前版本存在路径遍历漏洞，该漏洞源于文件解析前未能拒绝请求路径名中的点-点路径段，导致未经身份验证的攻击者可以绕过基于路由路径限制的中间件，读取受保护URL前缀下的文件。

CVSS 7.5 · High EPSS 0.67% · P50

Affected Version Matrix 2

VendorProduct Version RangeStatus
@fastify/static @fastify/static < 10.1.1 affected
10.1.1 unaffected
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I. Basic Information for CVE-2026-15074

Vulnerability Information
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Vulnerability Title
@fastify/static vulnerable to route guard bypass via path traversal
Source: CVE Program / CVE List V5
Vulnerability Description
@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 segments before applying its own path-traversal guard, an unauthenticated attacker can bypass any route-scoped middleware and read files inside the static root that live under the guarded URL prefix. The bypass does not allow access outside the configured static root by itself, it defeats route-guard filtering only. The issue is patched in @fastify/static 10.1.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Fastify static 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fastify static是Fastify组织的一个威胁情报网络辅助工具。 Fastify static 10.1.0及之前版本存在路径遍历漏洞，该漏洞源于文件解析前未能拒绝请求路径名中的点-点路径段，导致未经身份验证的攻击者可以绕过基于路由路径限制的中间件，读取受保护URL前缀下的文件。
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 0 ~ 10.1.1 -

II. Public POCs for CVE-2026-15074

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III. Intelligence Information for CVE-2026-15074

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Vendor Advisories for CVE-2026-15074 (1)

IV. Related Vulnerabilities

Same product: @fastify/static
Same vendor: @fastify/static
Same weakness: CWE-22

V. Comments for CVE-2026-15074

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