@hono/node-server: `serveStatic` decodes the request path a second time, leading to bypass of middleware on static paths

Why it is Yellow

• CVSS 5.3 medium
• On your watchlist: npm

Affected packages

References

• https://github.com/advisories/GHSA-rmxm-3fg6-px4f
• https://github.com/honojs/node-server/security/advisories/GHSA-rmxm-3fg6-px4f
• https://github.com/honojs/node-server/commit/982179278529d5673812116b042829f27794966f
• https://github.com/honojs/node-server/releases/tag/v2.1.3
• https://github.com/advisories/GHSA-rmxm-3fg6-px4f

Original description

@hono/node-server allows running the Hono application on Node.js. From 1.19.10 until 2.1.3, 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, although the flaw does not permit traversal outside that root. This issue is fixed in version 2.1.3.