Vulnerability · Published Mar 6, 2026 · Assigned by GitHub_M
CVE-2026-29087@hono/node-server: Authorization bypass for protected static paths via encoded slashes in Serve Static Middleware
High 7.5
In plain English
A high-severity incorrect authorization in node-server from honojs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
@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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @hono/node-server | 1.19.10 | GHSA-wc8c-qw6v-h7f6 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| honojs | node-server | < 1.19.10 |
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N