@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.
References
| Link | Resource |
|---|---|
| https://cna.openjsf.org/security-advisories.html | Third Party Advisory |
| https://github.com/fastify/fastify-static/security/advisories/GHSA-x428-ghpx-8j92 | Vendor Advisory |
| https://github.com/fastify/middie/security/advisories/GHSA-cxrg-g7r8-w69p | Not Applicable |
| https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr | Not Applicable |
Configurations
History
23 Apr 2026, 19:41
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:fastify:fastify-static:*:*:*:*:*:*:*:* | |
| First Time |
Fastify fastify-static
Fastify |
|
| References | () https://cna.openjsf.org/security-advisories.html - Third Party Advisory | |
| References | () https://github.com/fastify/fastify-static/security/advisories/GHSA-x428-ghpx-8j92 - Vendor Advisory | |
| References | () https://github.com/fastify/middie/security/advisories/GHSA-cxrg-g7r8-w69p - Not Applicable | |
| References | () https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr - Not Applicable |
16 Apr 2026, 13:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-04-16 13:16
Updated : 2026-04-23 19:41
NVD link : CVE-2026-6414
Mitre link : CVE-2026-6414
CVE.ORG link : CVE-2026-6414
JSON object : View
Products Affected
fastify
- fastify-static
CWE
CWE-177
Improper Handling of URL Encoding (Hex Encoding)