Home/CVE/Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, a path handling
CVE

CVE-2026-39407

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, a path handling

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, a path handling inconsistency in serveStatic allows protected static files to be accessed by using repeated slashes (//) in the request path. When route-based middleware (e.g., /admin/*) is used for authorization, the router may not match paths containing repeated slashes, while serveStatic resolves them as normalized paths.

This can lead to a middleware bypass. This vulnerability is fixed in 4.12.12.

MEDIUM · CVSS 5.3 EPSS 0.00021
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
▤

Affected Products & Versions

1
hono<= 4.12.11
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
npm hono MODERATE fixed in 4.12.12
▣

Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD08 Apr 2026 · 03:16 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/honojs/hono/commit/9aff14bd727f8b0435c963363fd803260e7b8e3cPatch
https://github.com/honojs/hono/releases/tag/v4.12.12Release Notes
https://github.com/honojs/hono/security/advisories/GHSA-wmmm-f939-6g9cVendor Advisory
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