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.

INFO

Published Date :

2026-04-16T13:09:03.526Z

Last Modified :

2026-04-16T13:48:52.393Z

Source :

openjs
AFFECTED PRODUCTS

The following products are affected by CVE-2026-6414 vulnerability.

Vendors Products
Fastify
  • Fastify-static
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-6414.

URL Resource
https://cna.openjsf.org/security-advisories.html cve-icon cve-icon cve-icon
https://github.com/fastify/fastify-static/security/advisories/GHSA-x428-ghpx-8j92 cve-icon cve-icon cve-icon
https://github.com/fastify/middie/security/advisories/GHSA-cxrg-g7r8-w69p cve-icon cve-icon cve-icon
https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-6414 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-6414 cve-icon
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CVSS Vulnerability Scoring System

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