Detections
Analytics
CVE-2026-59895
medium
Description
Hono is a Web application framework that provides support for any JavaScript runtime. From 4.0.0 before 4.12.27, cx() in hono/css composes class names from plain strings but marks the result as already escaped without HTML-escaping the input, allowing untrusted className values used in a JSX class attribute during server-side rendering to break out of the attribute and inject arbitrary markup. This issue is fixed in version 4.12.27.
References
https://github.com/honojs/hono/security/advisories/GHSA-w62v-xxxg-mg59
https://github.com/honojs/hono/releases/tag/v4.12.27
https://github.com/honojs/hono/commit/cd3f6f7194f0e5c9d4b26ae0cf232018d0f388fc