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EUVD-2026-373282

fkie_cve-2026-93981

hono before 4.13.7 fails to HTML-escape plain strings rendered by hono/jsx as a child or fallback of Suspense, as a string child of ErrorBoundary alongside an asynchronous sibling, as the single child of a Context.Provider, or as the root value passed to renderToString() or renderToReadableStream() from hono/jsx/dom/server. These paths stringify their input and treat the result as already-escaped markup, so an attacker who controls such a string during server-side rendering can inject arbitrary HTML and execute script under the application's origin.

GHSA-hxh3-vqpv-xpqv — hono/jsx renders plain strings unescaped in boundary components, leading to XSS

Affected: npm: hono

### Summary

`hono/jsx` does not HTML-escape a plain string placed directly as a child or `fallback` of `Suspense` or `ErrorBoundary`, as the only child of a `Context.Provider`, or as the root value of `renderToString()` / `renderToReadableStream()` from `hono/jsx/dom/server`. Such a string is emitted as markup instead of text.

### Details

These paths stringify their input and treat the result as already-escaped HTML, so a plain string passes through unchanged. Notable cases:

- `Suspense`: a string child, or a string `fallback` while a child suspends. With streaming, the fallback reaches the browser in the initial chunk. - `ErrorBoundary`: a string child alongside an asynchronous sibling. The all-synchronous case was fixed in 4.11.7 (GHSA-9r54-q6cx-xmh5). - `Context.Provider`: a single string child. Multiple children are escaped. - `hono/jsx/dom/server`: a string, or an array containing strings, passed as the root.

A lone `{children}` forwarded by a wrapper component is enough to reach these paths. Strings wrapped in an element, values from `raw()` or the `html` helper, and client-side rendering with `hono/jsx/dom` are not affected.

### Impact

An attacker who controls a string rendered in an affected position can inject arbitrary HTML into the server-rendered page, leading to cross-site scripting under the application's origin.

This issue affects applications that render untrusted strings directly in one of the positions above during server-side rendering.

RHSA-2026:71906 — Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

dompurify: DOMPurify: Cross-Site Scripting via IN_PLACE sanitization fast-uri: fast-uri: Security bypass due to inconsistent host case normalization hono: hono/jsx: Cross-Site Scripting via Unescaped Strings