CVE-2026-24473
📋 TL;DR
This vulnerability in Hono's static middleware for Cloudflare Workers allows attackers to read arbitrary environment keys by manipulating file paths. It affects Hono applications using the Cloudflare Workers adapter with static file serving enabled. The issue stems from improper path validation that exposes internal asset keys.
💻 Affected Systems
- Hono
📦 What is this software?
Hono by Hono
⚠️ Risk & Real-World Impact
Worst Case
Attackers could access sensitive environment variables like API keys, database credentials, or other secrets stored in Workers environment, leading to complete system compromise.
Likely Case
Attackers could read configuration secrets and environment variables, potentially enabling further attacks or data exfiltration.
If Mitigated
With proper input validation and environment variable isolation, impact would be limited to non-sensitive configuration data.
🎯 Exploit Status
Exploitation requires sending specially crafted requests to static file endpoints.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.11.7
Vendor Advisory: https://github.com/honojs/hono/security/advisories/GHSA-w332-q679-j88p
Restart Required: Yes
Instructions:
1. Update Hono package to version 4.11.7 or later
2. Run 'npm update hono' or 'yarn upgrade hono'
3. Redeploy your Cloudflare Workers application
4. Verify the update was successful
🔧 Temporary Workarounds
Disable static middleware
allTemporarily disable static file serving in Hono applications
Remove or comment out static middleware usage in your Hono app
Implement custom path validation
allAdd custom middleware to validate and sanitize file paths before static middleware
🧯 If You Can't Patch
- Implement strict input validation for all user-controlled paths
- Isolate sensitive environment variables from Workers environment
🔍 How to Verify
Check if Vulnerable:
Check if Hono version is below 4.11.7 and uses Cloudflare Workers adapter with static middlewareCheck Version:
npm list hono | grep honoVerify Fix Applied:
Verify Hono version is 4.11.7 or higher and test path traversal attempts return proper errors📡 Detection & Monitoring
Log Indicators:
- Unusual path patterns in static file requests
- Failed attempts to access non-existent static files with unusual extensions
Network Indicators:
- HTTP requests with crafted paths containing directory traversal patterns
- Requests to static endpoints with unusual parameter patterns
SIEM Query:
source="cloudflare-workers" AND (uri="*..*" OR uri="*%2e%2e*" OR uri="*%2f*" OR uri="*%5c*")