Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Hono | Hono | >= 4.0.0, <= 4.12.11 |
Related Weaknesses (CWE)
References
- https://github.com/honojs/hono/commit/b470278920fffcfd6d76002755d6db53db827679Patch
- https://github.com/honojs/hono/releases/tag/v4.12.12Release Notes
- https://github.com/honojs/hono/security/advisories/GHSA-xf4j-xp2r-rqqxExploitVendor Advisory
FAQ
What is CVE-2026-39408?
CVE-2026-39408 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 direc...
How severe is CVE-2026-39408?
CVE-2026-39408 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-39408?
Check the references section above for vendor advisories and patch information. Affected products include: Hono Hono.