CVE-2026-39408 | THREATINT

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.

PUBLISHED Reserved 2026-04-07 | Published 2026-04-08 | Updated 2026-04-08 | Assigner GitHub_M

MEDIUM: 5.9CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Problem types

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

Product status

< 4.12.12

affected

References

github.com/...s/hono/security/advisories/GHSA-xf4j-xp2r-rqqx

github.com/...ommit/b470278920fffcfd6d76002755d6db53db827679

github.com/honojs/hono/releases/tag/v4.12.12

cve.org (CVE-2026-39408)

nvd.nist.gov (CVE-2026-39408)

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