CVE-2026-44458
Medium
Description
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.18, the JSX renderer escapes style attribute object values for HTML but not for CSS. Untrusted input in a style object value or property name can therefore inject additional CSS declarations into the rendered style attribute. The impact is limited to CSS and does not allow JavaScript execution or HTML attribute breakout. This vulnerability is fixed in 4.12.18.
SeverityMedium
CVSS4.3
Exploit probability—
Product
Hono
PublishedMay 13, 2026
First seenMay 13, 2026
Weakness typeCWE-74InjectionCWE-116CWE-116
How to fix
Update
- hono hono4.12.18 or later
- hono4.12.18 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| hono hono | v < 4.12.18 | 4.12.18 |
| hononpm | v < 4.12.18 | 4.12.18 |
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