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Medium · 4.3 CVE-2026-44458 EUVD-2026-30037GHSA-qp7p-654g-cw7p

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

Published May 13, 2026 · Updated May 14, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
honojs hono < 4.12.18 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Wolfi

ReleasePackageFixed inAdvisory
Wolfi rolling langfuse-3-worker 3.176.0-r0 —

Affected packages

EcosystemPackageAffectedFixedRecord
npm hono < 4.12.18 4.12.18 GHSA-qp7p-654g-cw7p

References