CVE-2026-39364

The contents of files that are specified by server.fs.deny can be returned to the browser.

Details

On the Vite dev server, files that should be blocked by server.fs.deny (e.g., .env, *.crt) can be retrieved with HTTP 200 responses when query parameters such as ?raw, ?import&raw, or ?import&url&inline are appended.

PoC

1. Start the dev server: pnpm exec vite root --host 127.0.0.1 --port 5175 --strictPort
2. Confirm that server.fs.deny is enforced (expect 403): curl -i http://127.0.0.1:5175/src/.env | head -n 20
3. Confirm that the same files can be retrieved with query parameters (expect 200):

Only apps that match the following conditions are affected:

• explicitly exposes the Vite dev server to the network (using --host or server.host config option)
• the sensitive file exists in the allowed directories specified by server.fs.allow
• the sensitive file is denied with a pattern that matches a file by server.fs.deny

Kodem intelligence

1. What is CVE-2026-39364? CVE-2026-39364 is a high-severity security vulnerability in vite (npm), affecting versions >= 8.0.0, <= 8.0.4. It is fixed in 8.0.5, 7.3.2.
2. Which versions of vite are affected by CVE-2026-39364? vite (npm) versions >= 8.0.0, <= 8.0.4 is affected.
3. Is there a fix for CVE-2026-39364? Yes. CVE-2026-39364 is fixed in 8.0.5, 7.3.2. Upgrade to this version or later.
4. Is CVE-2026-39364 exploitable, and should I be worried? Whether CVE-2026-39364 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
5. What actually determines whether CVE-2026-39364 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
6. How do I fix CVE-2026-39364?
   • Upgrade vite to 8.0.5 or later
   • Upgrade vite to 7.3.2 or later