HTTP Request Smuggling Affecting hono package, versions <4.10.3
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-13720736
- published27 Oct 2025
- disclosed24 Oct 2025
- creditUnknown
Introduced: 24 Oct 2025
CVE-2025-71381 (opens in a new tab)How to fix?
Upgrade hono to version 4.10.3 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 CORS middleware, which copies the Vary header from the request to the response when the origin is not set to "*". An attacker can influence cache behavior or cause inconsistent cross-origin resource sharing enforcement by supplying crafted Vary headers in requests.
Note:
This is exploitable if shared caches or proxies rely on the Vary header for cache key calculation.