CVE-2026-39406

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

State: Published
Severity: 5.3 Medium
Published: Apr 8, 2026
Updated: Apr 8, 2026
Reserved: Apr 7, 2026

Description

@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.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	GitHub_M

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Affected Products

Product	Versions
node-serverhonojs	< 1.19.13Affected

References

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

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