VYPR
Medium severity6.1NVD Advisory· Published Jul 8, 2026· Updated Jul 10, 2026

CVE-2026-59895

CVE-2026-59895

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.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
hononpm
>= 4.0.0, < 4.12.274.12.27

Affected products

26

Patches

Vulnerability mechanics

References

5

News mentions

0

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