Improper Handling of URL Encoding (Hex Encoding) Affecting hono package, versions <4.12.4
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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-15419466
- published5 Mar 2026
- disclosed5 Mar 2026
- creditEdamAme-x, techfish-11
Introduced: 5 Mar 2026
NewCVE-2026-29045 (opens in a new tab)How to fix?
Upgrade hono to version 4.12.4 or higher.
Overview
hono is an Ultrafast web framework for the Edges
Affected versions of this package are vulnerable to Improper Handling of URL Encoding (Hex Encoding) via inconsistent URL decoding between the serveStatic process and route-based middleware protections. An attacker can access protected static resources without authorization by requesting paths with encoded slashes - e.g. /admin%2Fsecret.html.
Note: This vulnerability specifically affects applications that rely solely on route-based middleware to protect static subpaths.