CVE-2026-44458 MEDIUM

CVE-2026-44458: Hono: CSS Declaration Injection via Style Object Values in JSX SSR

Vendor Honojs
Product hono
Weakness CWE-74
Published May 13, 2026
Last update May 14, 2026
View on NVD All CVEs

CVSS base score

4.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality None
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 13, 2026 CVE published
May 14, 2026 Record updated