CVE-2026-6414
5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Summary
@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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| @fastify/static | @fastify/static | 8.0.0 < 9.1.1 | affected |
| @fastify/static | @fastify/static | 9.1.1 | unaffected |
Weaknesses
- CWE-177: CWE-177: Improper Handling of URL Encoding (Hex Encoding)
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
- https://github.com/fastify/middie/security/advisories/GHSA-cxrg-g7r8-w69p
- https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr
- https://github.com/fastify/fastify-static/security/advisories/GHSA-x428-ghpx-8j92
- https://cna.openjsf.org/security-advisories.html
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