Summary

This release (v4.12.14) fixes security and request-processing issues discovered in the hono project.

• Critical fix in hono/jsx server-side rendering: validation for JSX attribute names was added to prevent malformed attribute keys from corrupting generated HTML and enabling unintended attributes/elements (GHSA-458j-xx4x-4375).
• Fix in aws-lambda integration: improved handling of invalid header names during request processing to avoid malformed headers or unexpected behavior (#4883).

Upgrade to v4.12.14 to receive these fixes.

Key Points

• Validation added for JSX attribute names in hono/jsx SSR to prevent HTML corruption and attribute injection.
• aws-lambda request processing now properly handles/rejects invalid header names to avoid header-related issues.
• Recommended action: update your dependency to v4.12.14 (e.g. npm install hono@4.12.14 or yarn add hono@4.12.14) and run your test suite; consider auditing any server-side rendering and Lambda header handling code for related assumptions.

References

• GHSA-458j-xx4x-4375 — hono/jsx SSR attribute validation fix
• Pull request: #4883 — aws-lambda header handling fix

Notes for Engineers

• If you use hono/jsx for SSR, review any custom attribute handling or sanitization logic; rely on the patched library for attribute-name validation.
• If you deploy on AWS Lambda, ensure proxies or integrations do not introduce invalid header names upstream; after upgrading, monitor logs for rejected/normalized headers.