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

Quick assessment

Affected
@fastify/middie @fastify/middie
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 @fastify/middie是Fastify团队开源的一个为开发框架提供标准中间件兼容能力的插件。 Fastify @fastify/middie 9.1.0版本至9.3.4之前版本存在处理逻辑错误漏洞，该漏洞源于路径作用域中间件通过匹配原始请求目标决定是否运行，而Fastify路由器在分发前将绝对形式请求目标解析为路径，导致两层评估不同字符串，路径作用域中间件（如身份验证或授权）被跳过，可能导致未经身份验证的网络攻击者绕过基于路径的访问控制。

CVSS 9.1 · Critical EPSS 0.33% · P26

Possible ATT&CK Techniques 1 AI

T1598 · Phishing for Information

Affected Version Matrix 2

VendorProduct Version RangeStatus
@fastify/middie @fastify/middie 9.1.0< 9.3.4 affected
9.3.4 unaffected
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I. Basic Information for CVE-2026-85184

Vulnerability Information
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Vulnerability Title
@fastify/middie vulnerable to path-scoped middleware bypass via absolute-form request target
Source: CVE Program / CVE List V5
Vulnerability Description
@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 using an absolute-form target reaches the route handler while the path-scoped middleware, such as authentication or authorization, is skipped. An unauthenticated network attacker can use this to bypass path-based access controls in a Fastify application that relies on middie for those controls. Users should upgrade to @fastify/middie 9.3.4 or later.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
解释冲突
Source: CVE Program / CVE List V5
Vulnerability Title
Fastify @fastify/middie 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fastify @fastify/middie是Fastify团队开源的一个为开发框架提供标准中间件兼容能力的插件。 Fastify @fastify/middie 9.1.0版本至9.3.4之前版本存在处理逻辑错误漏洞，该漏洞源于路径作用域中间件通过匹配原始请求目标决定是否运行，而Fastify路由器在分发前将绝对形式请求目标解析为路径，导致两层评估不同字符串，路径作用域中间件（如身份验证或授权）被跳过，可能导致未经身份验证的网络攻击者绕过基于路径的访问控制。
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/middie @fastify/middie 9.1.0 ~ 9.3.4 -

II. Public POCs for CVE-2026-85184

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III. Intelligence Information for CVE-2026-85184

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Vendor Advisories for CVE-2026-85184 (1)

IV. Related Vulnerabilities

Same product: @fastify/middie
Same vendor: @fastify/middie
Same weakness: CWE-436

V. Comments for CVE-2026-85184

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