CVE-2026-39406

MEDIUM5.3

@hono/node-server has a middleware bypass via repeated slashes in serveStatic

Published Apr 8, 2026

Modified 1 months ago

Details

@hono/node-server allows running the Hono application on Node.js. Prior to 1.19.13, 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 1.19.13.

References

WEB

https://github.com/honojs/node-server/security/advisories/GHSA-92pp-h63x-v22m

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-39406

CVSS Analysis

CVSS v3.1

5.3

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity