Hono: `serveStatic` decodes the request path a second time, leading to bypass of middleware on static paths

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-111757
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-19 18:17:00 UTC
Updated2026-10-20 17:17:29 UTC
DescriptionHono is a Web application framework that provides support for any JavaScript runtime. From 4.12.4 until 4.13.11, serveStatic can interpret a malformed percent-encoded path differently from upstream routing middleware and bypass protection for a static prefix. The root cause is serveStatic decodes a routed request path a second time before filesystem lookup. The attack mechanism is malformed percent encoding survives the first routing interpretation and becomes a protected path only during the later static-file decode. The affected component is serveStatic. The trigger conditions are an application protects a static prefix with upstream middleware and serveStatic receives an attacker-controlled malformed percent-encoded path. The impact is unauthorized disclosure of a static file that upstream middleware was intended to protect. The issue does not permit traversal outside the configured static root. This issue is fixed in version 4.13.11.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS: 0.002230000 probability, percentile 0.120800000 (date 2026-10-20)

Problem Types: CWE-174 | CWE-174 CWE-174: Double Decoding of the Same Data

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Honojs Hono affected >= 4.12.4, < 4.13.11 Not specified

References

ReferenceSourceLinkTags
github.com/honojs/hono/commit/8b05c774ef1555c70f5ba5e2991b7e77cc3635cc [email protected] github.com
github.com/honojs/hono/security/advisories/GHSA-5r4p-p66f-jhc7 [email protected] github.com
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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