Bug 2498151 (CVE-2026-59895) - CVE-2026-59895 hono: Hono: Arbitrary markup injection via improper handling of class names in server-side rendering.
Summary: CVE-2026-59895 hono: Hono: Arbitrary markup injection via improper handling o...
Keywords:
Status: NEW
Alias: CVE-2026-59895
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-08 17:02 UTC by OSIDB Bzimport
Modified: 2026-07-28 09:10 UTC (History)
19 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-07-08 17:02:12 UTC 
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.
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