CVE-2026-39406
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk30th percentile - higher than 30% of all known CVEs
Summary
@hono/node-server before version 1.19.13 has a path handling inconsistency in serveStatic that allows protected static files to be accessed by using repeated slashes (//) in the request path. Route-based middleware may not match paths with repeated slashes, while serveStatic resolves them as normalized paths, leading to a middleware bypass.
Risk Assessment
Unauthenticated users can access protected static files, such as configurations or sensitive data.
Recommendation
Upgrade @hono/node-server to version 1.19.13 or later.
Other vulnerabilities in @hono/node-server
See all- CVE-2026-118663Medium
From 1.19.10 until 2.1.3, @hono/node-server's serveStatic decodes a request path a second time after Hono has already decoded it for routing, so a malformed percent-encoded sequence can make route middleware evaluate an encoded path while static file resolution uses a different directory. An unauthenticated attacker can bypass middleware mounted on a protected static prefix and read a file inside the configured static root.
- CVE-2026-73565Medium
@hono/node-server from version 2.0.0 to 2.0.10 has a vulnerability in WebSocket handling where an upgrade request with a missing or malformed Sec-WebSocket-Key header causes the request to remain in waiterMap with no cleanup path after the handshake is aborted. This allows an unauthenticated attacker to flood a public route, causing unbounded memory growth and service unavailability.
Original NVD description (English source)
@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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS