CVE-2026-44458

MEDIUM

Hono: CSS Declaration Injection via Style Object Values in JSX SSR

Title source: cna
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 4.3
EPSS 0.0020
EPSS Percentile 9.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-116 CWE-74
Status published
Products (2)
hono/hono < 4.12.18
honojs/hono < 4.12.18
Published May 13, 2026
Tracked Since May 13, 2026