honojs hono up to 4.13.6 JSX Rendering hono/jsx/dom/server renderToString/renderToReadableStream cross site scripting

Summaryinfo

A vulnerability identified as problematic has been detected in honojs hono up to 4.13.6. The affected element is the function renderToString/renderToReadableStream of the file hono/jsx/dom/server of the component JSX Rendering. This manipulation causes cross site scripting. This vulnerability is handled as CVE-2026-93981. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in honojs hono up to 4.13.6. It has been declared as problematic. Affected by this vulnerability is the function renderToString/renderToReadableStream of the file hono/jsx/dom/server of the component JSX Rendering. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-93981 since 09/19/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 4.13.7 eliminates this vulnerability.

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Productinfo

Vendor

• honojs

Name

• hono

Version

• 4.13.0
• 4.13.1
• 4.13.2
• 4.13.3
• 4.13.4
• 4.13.5
• 4.13.6

Website

• Product: https://github.com/honojs/hono/

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