HTTP Request Smuggling Affecting hono package, versions <4.12.21
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-HONO-17055743
- published29 May 2026
- disclosed28 May 2026
- creditRootingg
Introduced: 28 May 2026
NewCVE-2026-47676 (opens in a new tab)How to fix?
Upgrade hono to version 4.12.21 or higher.
Overview
hono is an Ultrafast web framework for the Edges
Affected versions of this package are vulnerable to HTTP Request Smuggling via the app.mount function. An attacker can access unintended routes or resources by sending requests with percent-encoded multi-byte characters in the URL path, leading to incorrect routing.