HTTP Request Smuggling Affecting hono package, versions <4.9.7
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-12668833
- published14 Sept 2025
- disclosed12 Sept 2025
- creditimenyoo2, mwlik
Introduced: 12 Sep 2025
NewCVE-2025-59139 (opens in a new tab)How to fix?
Upgrade hono to version 4.9.7 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 bodyLimit middleware when conflicting HTTP headers are present. An attacker can cause excessive memory or CPU consumption by sending oversized request bodies that bypass the configured size limit.
Note:
This is exploitable if the deployment environment or runtime does not reject requests with both Content-Length and Transfer-Encoding: chunked headers.