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CVE-2026-39406

@hono/node-server has a middleware bypass via repeated slashes in serveStatic

Published: Apr 8, 2026Updated: Apr 21, 2026 Sources: CVE List NVDCWE-22
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.4%
Top 70.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

@hono/node-server allows running the Hono application on Node.js. Prior to 1.19.13, 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 1.19.13.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-22

Affected Products

node-serverhono
Library
OSS Libraries / web-framework
node-serverhonojs
Library
OSS Libraries / web-framework
honooss-projectOSS Librariesaka hono js
honojsoss-projectOSS Librariesaka hono

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Collection
Discovery
View detailed technique mapping

References

https://github.com/honojs/node-server/security/advisories/GHSA-92pp-h63x-v22m
github.com

Timeline

Published
Apr 8, 2026
Last Updated
Apr 21, 2026

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