Injection Vulnerability in Hono Framework Affects JavaScript Runtimes

CVE-2026-29085

What is CVE-2026-29085?

The Hono Framework, a versatile web application framework for JavaScript runtimes, contains a vulnerability in its streamSSE() functionality within the Streaming Helper. The event, id, and retry fields were susceptible to injection of additional Server-Sent Events (SSE) fields due to the lack of validation for carriage return ( ) and newline ( ) characters. This could potentially allow attackers to manipulate SSE packets through untrusted input, leading to unintended behavior or information leakage. The issue has been resolved in version 4.12.4, making it imperative for users to update to this version to ensure protection.

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