## Hono.js Static Site Generator Path Traversal Vulnerability (CVE-2026-39408) Exposes File System Risk
A critical path traversal vulnerability in the Hono.js web framework's static site generation function, `toSSG()`, allows attackers to write files outside the configured output directory. The flaw, tracked as CVE-2026-39408, is triggered when using dynamic route parameters via `ssgParams`. An attacker can craft malicious parameter values that manipulate the generated file paths, causing them to escape the intended directory boundary. This creates a direct risk of arbitrary file write and potential remote code execution on the host server.

The vulnerability is present in versions prior to Hono v4.12.14. The security advisory from the Hono.js team details that the issue is specific to the static site generation process. The update to version 4.12.14 patches this security hole. The GitHub pull request labeled as a security update for the dependency highlights the immediate need for developers to apply this patch.

This vulnerability places any application using Hono's static site generation feature at significant risk. Developers and organizations must prioritize updating their dependencies to the patched version to mitigate the threat of unauthorized file system access and potential server compromise. The presence of a CVE identifier and a dedicated security advisory underscores the severity and the formal recognition of this security flaw within the ecosystem.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: cybersecurity, vulnerability, open-source, web-framework, CVE
- **Credibility**: unverified
- **Published**: 2026-04-16 02:22:22
- **ID**: 66622
- **URL**: https://whisperx.ai/en/intel/66622