CVEvulnerability
CVE-2026-6414
5.9 MEDIUM
Official page ↗
- Status
- Analyzed
- Published
- 2026-04-16
- Last modified
- 2026-06-17
- Assigner
- ce714d77-add3-4f53-aff5-83d477b104bb
- CVSS 3.1 (ce714d77-add3-4f53-aff5-83d477b104bb)
- 5.9 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weaknesses
- CWE-177
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.
Affected configurations
• fastify fastify-static (>= 8.0.0 < 9.1.1)
Related
Weakness · CWE (1)
- CWE-177 Improper Handling of URL Encoding (Hex Encoding) weakness
References
- 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