CVE-2026-6414

@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.

• CWE-177

• https://cna.openjsf.org/security-advisories.htmlThird Party Advisory
• https://github.com/fastify/fastify-static/security/advisories/GHSA-x428-ghpx-8j92Vendor Advisory
• https://github.com/fastify/middie/security/advisories/GHSA-cxrg-g7r8-w69pNot Applicable
• https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwrNot Applicable

Published

Apr 16, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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