CVE-2026-29087: Hono Node-Server

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

@hono/node-server allows running the Hono application on Node.js. Prior to version 1.19.10, when using @hono/node-server's static file serving together with route-based middleware protections (e.g. protecting /admin/*), inconsistent URL decoding can allow protected static resources to be accessed without authorization. In particular, paths containing encoded slashes (%2F) may be evaluated differently by routing/middleware matching versus static file path resolution, enabling a bypass where middleware does not run but the static file is still served. This issue has been patched in version 1.19.10.

Affected products

• Hono Node-Server: before 1.19.10 (fixed in 1.19.10)

Published 2026-03-06. Last modified 2026-06-17.