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.

INFO

Published Date :

2026-02-27T18:25:37.428Z

Last Modified :

2026-02-27T18:56:02.979Z

Source :

openjs
AFFECTED PRODUCTS

The following products are affected by CVE-2026-2880 vulnerability.

Vendors Products
Fastify
  • Middie
Openjsf
  • \@fastify\/middie
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-2880.

URL Resource
https://github.com/fastify/middie/security/advisories/GHSA-8p85-9qpw-fwgw cve-icon cve-icon
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CVSS Vulnerability Scoring System

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Detailed values of each vector for above chart.
Attack Vector
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Privileges Required
User Interaction
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Confidentiality Impact
Integrity Impact
Availability Impact