v4.12.17

honojs/honov4.12.17May 5, 2026by yusukebe

AI Summary

This patch release includes four bug fixes across JSX, SSG, CORS, and type definitions. The most notable change makes the origin parameter optional in CORSOptions, improving flexibility for CORS configuration.

Key Highlights

Fix: Normalize SVG attributes on the <svg> root element in JSX
Fix: Add `atom+xml` and `rss+xml` to `defaultExtensionMap` for SSG
Fix: Make origin optional in CORSOptions for better usability
Fix: Propagate middleware response types to app.on overloads

Full Release Notes

## What's Changed
* fix(jsx): normalize SVG attributes on the <svg> root element by @kfly8 in https://github.com/honojs/hono/pull/4893
* fix(ssg): add `atom+xml` and `rss+xml` to `defaultExtensionMap` by @yuintei in https://github.com/honojs/hono/pull/4899
* fix(cors): make origin optional in CORSOptions by @truffle-dev in https://github.com/honojs/hono/pull/4905
* fix(types): propagate middleware response types to app.on overloads by @T4ko0522 in https://github.com/honojs/hono/pull/4906

## New Contributors
* @kfly8 made their first contribution in https://github.com/honojs/hono/pull/4893
* @truffle-dev made their first contribution in https://github.com/honojs/hono/pull/4905

**Full Changelog**: https://github.com/honojs/hono/compare/v4.12.16...v4.12.17