## Vite Dev Server Security Flaw Exposes Source Maps to Network Attackers
A critical security vulnerability in the Vite development server allows attackers to access any file ending in `.map` on the host system, potentially exposing sensitive source code and internal project structure. The flaw, tracked as GHSA-4w7w-66w2-5vf9, is present in versions prior to Vite 8.0.5. This is not a theoretical risk; it enables the exfiltration of source map files from anywhere on the server, even outside the project's root directory, if the dev server is network-exposed.

The vulnerability specifically impacts developers who explicitly expose their Vite dev server to the network using the `--host` command-line flag or the `server.host` configuration option. Under these conditions, a remote attacker could request and retrieve `.map` files, which often contain the original, unminified source code, variable names, and file paths. This dramatically lowers the barrier for reverse-engineering an application and identifying potential attack vectors within the codebase.

The fix is contained in Vite version 8.0.5. The update, now being pushed via dependency managers like RenovateBot, patches the improper file path resolution. This incident underscores the persistent security risks in modern development toolchains, where convenience features like hot-reload servers can become unintended attack surfaces if not properly secured. Teams must immediately audit their development and CI/CD environments to ensure they are not running vulnerable, network-exposed instances.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: vulnerability, source-map, dev-server, supply-chain, open-source
- **Credibility**: unverified
- **Published**: 2026-04-06 20:27:25
- **ID**: 51896
- **URL**: https://whisperx.ai/en/intel/51896