CVE-2026-39408
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Hono
PublishedApr 8, 2026
First seenApr 8, 2026
Weakness typeCWE-22Path traversal
How to fix
Update
- hono4.12.12 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| hono hono | 4.0.0 ≤ v ≤ 4.12.11 | — |
| hononpm | 4.0.0 ≤ v < 4.12.12 | 4.12.12 |
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