Vite Dev Server File Disclosure and Information Leakage Vulnerability (CVE-2025-31125) Analysis & Mitigation Guide
Executive & SecOps Summary
SECOPS ASSESSMENTProjects running Vite development server exposed to the network (via --host or server.host configuration) using versions prior to 6.2.4, 6.1.3, 6.0.13, 5.4.16, and 4.5.11
Remote attackers can bypass access restrictions and retrieve sensitive source code or system files by appending crafted query parameters (?inline&import or ?raw?import) to requests
Immediately upgrade Vite to the patched versions (6.2.4, 6.1.3, 6.0.13, 5.4.16, or 4.5.11) and disable unnecessary external host binding (--host)
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Upgrade Vite to the latest secure patch version using your package manager.
# For npm users
npm install vite@latest --save-dev
# Or target a specific patched version
npm install vite@6.2.4 --save-dev
# For yarn users
yarn upgrade vite@6.2.4
# For pnpm users
pnpm update vite@6.2.42. Temporary Workaround & Hardening Configuration
If an immediate upgrade is not feasible, restrict the dev server to bind only to the loopback interface (localhost) to prevent external access.
// vite.config.js
import { defineConfig } from 'vite';
export default defineConfig({
server: {
// Restrict access to localhost only
host: '127.0.0.1',
port: 5173,
strictPort: true
}
});3. Log Audit & IoC Verification Commands
Verify the installed Vite version and inspect access logs for potential exploitation attempts.
# 1. Check the currently installed Vite version in the project
npm list vite
# 2. Scan reverse proxy or dev server logs for suspicious query parameters
grep -E '\?(inline&import|raw\?import)' /var/log/nginx/access.log || echo 'No exploitation attempts detected'Block Exploits Instantly with Managed Virtual Patching Rules
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Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2025-31125) is an information disclosure flaw in Vite, a popular frontend tooling framework. Vite's development server implements security boundaries to prevent unauthorized access to files outside the project root. However, a logical flaw in handling specific query parameter combinations (?inline&import or ?raw?import) allows attackers to bypass these access controls (CWE-200, CWE-284) and expose the contents of restricted files.
2. Exploitation Mechanics & Attack Scenario
The vulnerability is exploitable only when the Vite dev server is explicitly exposed to the network using the --host CLI flag or the server.host configuration option. An attacker with network access to the dev server can send HTTP requests targeting sensitive files, appending the malicious query strings ?inline&import or ?raw?import. The server processes these parameters and returns the raw file contents in the response, bypassing standard directory traversal and access control checks. This vulnerability is actively exploited in the wild and is listed in the CISA KEV catalog, with an EPSS score of 0.7494.
3. Infrastructure & Business Impact
Exploitation of this vulnerability can lead to the exposure of critical assets, including .env files containing API keys, database credentials, and proprietary source code. If developers expose their local environments to public networks or shared corporate networks, attackers can leverage these leaked credentials to pivot into internal infrastructure, leading to potential supply chain compromises or broader corporate network breaches.
Official Vendor Advisories & References
Vite is a frontend tooling framework for javascript. Vite exposes content of non-allowed files using ?inline&import or ?raw?import. Only apps explicitly exposing the Vite dev server to the network (using --host or server.host config option) are affected. This vulnerability is fixed in 6.2.4, 6.1.3, 6.0.13, 5.4.16, and 4.5.11.
Frequently Asked SecOps Questions (CVE-2025-31125)
FAQQ1. How critical is CVE-2025-31125 and is it actively exploited in the wild?
CVE-2025-31125 is rated CVSS 5.3 (MEDIUM) with a 30-day EPSS exploitation probability of 74.9%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2025-31125?
Primary impacted vendors include vitejs across vite. Scope summary: Vite versions < 6.2.4, < 6.1.3, < 6.0.13, < 5.4.16, and < 4.5.11 when the dev server is exposed to the network
Q3. What temporary mitigations or workarounds exist for CVE-2025-31125 before patching?
[Mitigation] Immediately upgrade Vite to the patched versions (6.2.4, 6.1.3, 6.0.13, 5.4.16, or 4.5.11) and disable unnecessary external host binding (--host) Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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