AIKIDO-2026-11189
hono is vulnerable to Path Traversal
59
Medium Risk
This Affects:
honoTL;DR
The serve-static middleware rejects dot-segment and double-separator paths but allowed a lone backslash in the decoded filename. On Windows the path resolver treats backslash as a separator, so a single URL segment containing an encoded backslash can resolve into a nested protected file. An unauthenticated attacker can read static files behind prefix-mounted guards without escaping the configured root. The guard now rejects any decoded path containing a backslash separator.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you serve static files on Windows hosts using serve-static with prefix-mounted middleware guards.
Background info
hono is vulnerable to Path Traversal in versions 0.0.1 - 4.12.24.
How to fix this
Upgrade the hono library to the patch version.
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