Vulnerability Description
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, a path handling inconsistency in serveStatic allows protected static files to be accessed by using repeated slashes (//) in the request path. When route-based middleware (e.g., /admin/*) is used for authorization, the router may not match paths containing repeated slashes, while serveStatic resolves them as normalized paths. This can lead to a middleware bypass. This vulnerability is fixed in 4.12.12.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Hono | Hono | <= 4.12.11 |
Related Weaknesses (CWE)
References
- https://github.com/honojs/hono/commit/9aff14bd727f8b0435c963363fd803260e7b8e3cPatch
- https://github.com/honojs/hono/releases/tag/v4.12.12Release Notes
- https://github.com/honojs/hono/security/advisories/GHSA-wmmm-f939-6g9cVendor Advisory
FAQ
What is CVE-2026-39407?
CVE-2026-39407 is a vulnerability with a CVSS score of 5.3 (MEDIUM). Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, a path handling inconsistency in serveStatic allows protected static files to be accessed by usi...
How severe is CVE-2026-39407?
CVE-2026-39407 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-39407?
Check the references section above for vendor advisories and patch information. Affected products include: Hono Hono.