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CVE-2026-39408

Hono has a path traversal in toSSG() allows writing files outside the output directory

Published: Apr 8, 2026Updated: Apr 21, 2026 Sources: CVE List NVDCWE-22
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.5%
Top 59.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, a path traversal issue in toSSG() allows files to be written outside the configured output directory during static site generation. When using dynamic route parameters via ssgParams, specially crafted values can cause generated file paths to escape the intended output directory. This vulnerability is fixed in 4.12.12.

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-22

Affected Products

honohonojs
Library
OSS Libraries / web-framework
honohono
Library
OSS Libraries / web-framework
honojsoss-projectOSS Librariesaka hono
honooss-projectOSS Librariesaka hono js

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/hono/security/advisories/GHSA-xf4j-xp2r-rqqx
github.com
https://github.com/honojs/hono/commit/b470278920fffcfd6d76002755d6db53db827679
github.com
https://github.com/honojs/hono/releases/tag/v4.12.12
github.com

Timeline

Published
Apr 8, 2026
Last Updated
Apr 21, 2026

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