CVE-2025-69226
📋 TL;DR
This vulnerability in AIOHTTP allows attackers to determine the existence of absolute path components through path normalization logic in static file handling. It affects applications using web.static() (not recommended for production) in AIOHTTP versions 3.13.2 and below. The issue could enable information disclosure about server directory structure.
💻 Affected Systems
- aiohttp
📦 What is this software?
Aiohttp by Aiohttp
⚠️ Risk & Real-World Impact
Worst Case
Attackers could map server directory structure, potentially identifying sensitive files or configuration paths that could be targeted in subsequent attacks.
Likely Case
Information disclosure revealing existence of specific directories or files, which could aid in reconnaissance for further exploitation.
If Mitigated
Minimal impact if web.static() is not used or proper access controls limit exposure.
🎯 Exploit Status
Exploitation requires web.static() usage and involves path manipulation requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.13.3
Vendor Advisory: https://github.com/aio-libs/aiohttp/security/advisories/GHSA-54jq-c3m8-4m76
Restart Required: Yes
Instructions:
1. Update aiohttp package using pip: pip install --upgrade aiohttp==3.13.3
2. Restart the application/service using aiohttp
3. Verify the version is now 3.13.3 or higher
🔧 Temporary Workarounds
Disable web.static() usage
allRemove or disable usage of web.static() function in aiohttp applications
Review application code and remove/comment out web.static() usage
Use alternative static file serving
allReplace web.static() with production-ready static file serving solutions
Consider using nginx, Apache, or dedicated Python static file handlers
🧯 If You Can't Patch
- Disable web.static() functionality entirely in affected applications
- Implement strict WAF rules to block path traversal attempts and abnormal path requests
🔍 How to Verify
Check if Vulnerable:
Check if application uses web.static() and aiohttp version is ≤3.13.2Check Version:
python -c "import aiohttp; print(aiohttp.__version__)"Verify Fix Applied:
Verify aiohttp version is ≥3.13.3 and test path normalization behavior📡 Detection & Monitoring
Log Indicators:
- Unusual path requests containing absolute path components or multiple slashes
- Failed static file requests with abnormal path patterns
Network Indicators:
- HTTP requests with crafted paths attempting to bypass normalization
- Repeated requests with varying path components
SIEM Query:
source="web_logs" AND (uri MATCHES "//" OR uri MATCHES "/./" OR uri CONTAINS "/../")