CVE-2026-109955 Details
Description
Hono from 4.12.4 before 4.13.11 contains a middleware bypass vulnerability in serveStatic that allows unauthenticated attackers to skip prefix middleware by exploiting double path decoding. Attackers can send malformed percent-encoded paths that the router matches in encoded form, reaching static files without authentication checks running.
A middleware bypass vulnerability has been identified in Hono versions 4.12.4 prior to 4.13.11. This vulnerability resides in the serveStatic function, where unauthenticated attackers can exploit double path decoding to skip prefix middleware. By sending malformed percent-encoded paths, attackers can manipulate the routing to match encoded forms, allowing access to static files without undergoing necessary authentication checks. This issue arises because Hono decodes request paths before routing, and serveStatic decodes them again, creating a window for exploitation.
Users can upgrade to Hono version 4.13.11 or later to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 13, 2026CISA-ADP
Assessed Oct 13, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-174 | Double Decoding of the Same Data | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Hono | >= 4.12.4, < 4.13.11 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 13, 2026 | New CVE Received | [email protected] |
| Oct 13, 2026 | CVE Modified | CISA-ADP |