Hono Files

Security fixes

This release includes fixes for the following security issues:

mount() and app.mount() can forward a path that bypasses middleware scoped inside the mount prefix

Affects: mount() in hono/mount and app.mount(). A dynamic prefix such as /api/:tenant/* was removed by the length of the route pattern. The forwarded path was also re-normalized by the URL parser, so a decoded \ became / and .. collapsed. Both let a crafted request skip middleware scoped inside the mount prefix. Routes such as /assets* and duplicate parameter names now throw. GHSA-4m76-xfj5-7975

RegExpRouter skips wildcard middleware for certain route patterns and for paths with an encoded line terminator

Affects: RegExpRouter, including the default SmartRouter. Wildcard middleware was not applied in three cases: a parameter written as {[^/]+} in the middleware path only, a /prefix* route next to /prefix/* middleware, and a path with an encoded line terminator. RegExpRouter now covers the same routes as the other routers. Custom patterns that can match the empty string, such as {[0-9]*}, throw UnsupportedPathError. Regenerate PreparedRegExpRouter data. GHSA-h7mg-cq63-vhpq

validator('form') skips validation for multipart/form-data requests with extra parameters

Affects: validator('form') in hono/validator. A multipart/form-data request with an extra parameter such as charset was not recognized as a form. The validator then saw an empty object while the handler could read all fields. GHSA-4h7h-rv7c-7m2v

css helper does not escape a closing tag assembled from template parts and values, allowing HTML injection

Affects: css in hono/css. A </style> split between the template and a value, or between two values, was not escaped. Closing tags are now escaped after minification. GHSA-3gg2-335m-rxc6

csrf() does not check requests sent by hyperlink auditing (text/ping)

Affects: csrf() in hono/csrf. A POST sent by Chromium's <a ping> has the content type text/ping and was not checked against Origin and Sec-Fetch-Site. GHSA-46wx-v44x-9hh2

Users who rely on path-scoped middleware with mount(), wildcard middleware with the default router, validator('form'), the css helper with untrusted values, or csrf() are strongly encouraged to upgrade to this version.

What's Changed

• fix(jwt): reject a signature segment outside the base64url alphabet and a header with crit in https://github.com/honojs/hono/pull/5597

Full Changelog: https://github.com/honojs/hono/compare/v4.13.15...v4.13.16