Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-2880— @fastify/middie has an improper path normalization vulnerability

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/middie是Fastify开源的一个中间件引擎。 @fastify/middie 9.2.0之前版本存在安全漏洞，该漏洞源于路径范围中间件在使用路由器规范化选项时可能被绕过，可能导致身份验证或授权绕过。

AI Predicted 8.1 Difficulty: Moderate EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1078.002 · Domain Accounts
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-2880

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
@fastify/middie has an improper path normalization vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in @fastify/middie versions < 9.2.0 can result in authentication/authorization bypass when using path-scoped middleware (for example, app.use('/secret', auth)). When Fastify router normalization options are enabled (such as ignoreDuplicateSlashes, useSemicolonDelimiter, and related trailing-slash behavior), crafted request paths may bypass middleware checks while still being routed to protected handlers.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
@fastify/middie 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
@fastify/middie是Fastify开源的一个中间件引擎。 @fastify/middie 9.2.0之前版本存在安全漏洞，该漏洞源于路径范围中间件在使用路由器规范化选项时可能被绕过，可能导致身份验证或授权绕过。
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 0.0.0 ~ 9.2.0 -

II. Public POCs for CVE-2026-2880

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-2880

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-2880 (1)

IV. Related Vulnerabilities

Same product: @fastify/middie
Same vendor: @fastify/middie
Same weakness: CWE-20

V. Comments for CVE-2026-2880

No comments yet

Leave a comment