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CVE-2026-29087

@hono/node-server: Authorization bypass for protected static paths via encoded slashes in Serve Static Middleware

Published: Mar 6, 2026Updated: Apr 14, 2026 Sources: CVE List NVD GHSACWE-863
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.3%
Top 75.8%
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 version 1.19.10, when using @hono/node-server's static file serving together with route-based middleware protections (e.g. protecting /admin/*), inconsistent URL decoding can allow protected static resources to be accessed without authorization. In particular, paths containing encoded slashes (%2F) may be evaluated differently by routing/middleware matching versus static file path resolution, enabling a bypass where middleware does not run but the static file is still served. This issue has been patched in version 1.19.10.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI: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:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-863

Affected Products

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

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
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References

https://github.com/honojs/node-server/commit/455015be1697dd89974a68b70350ea7b2d126d2e
github.com
https://github.com/honojs/node-server/security/advisories/GHSA-wc8c-qw6v-h7f6
github.com
https://nvd.nist.gov/vuln/detail/CVE-2026-29087
nvd.nist.gov
and 1 more references View all →

Timeline

Published
Mar 6, 2026
Last Updated
Apr 14, 2026

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