[ CVE-2026-111757 · Published 19 Oct 2026 ]
Hono: `serveStatic` decodes the request path a second time, leading to bypass of middleware on static paths
[ Description ]Official description
Hono is a Web application framework that provides support for any JavaScript runtime. From 4.12.4 until 4.13.11, serveStatic can interpret a malformed percent-encoded path differently from upstream routing middleware and bypass protection for a static prefix. The root cause is serveStatic decodes a routed request path a second time before filesystem lookup. The attack mechanism is malformed percent encoding survives the first routing interpretation and becomes a protected path only during the later static-file decode. The affected component is serveStatic. The trigger conditions are an application protects a static prefix with upstream middleware and serveStatic receives an attacker-controlled malformed percent-encoded path. The impact is unauthorized disclosure of a static file that upstream middleware was intended to protect. The issue does not permit traversal outside the configured static root. This issue is fixed in version 4.13.11.
[ Fixes ]Fixes and patches
- hono 4.13.11Fixed version · GitHub Advisories · npm package hono: upgrade to 4.13.11 or later (affected >= 4.12.4, < 4.13.11)
[ Packages ]Affected open-source packages
- hono npmAffected >= 4.12.4, < 4.13.11 · fixed in 4.13.11 · GHSA-5r4p-p66f-jhc7