CVE-2025-69225
📋 TL;DR
AIOHTTP versions 3.13.2 and below contain a parser vulnerability that allows non-ASCII decimal characters in HTTP Range headers. This could potentially enable HTTP request smuggling attacks where attackers manipulate how servers interpret requests. Anyone using vulnerable AIOHTTP versions as an HTTP server is affected.
💻 Affected Systems
- aiohttp
📦 What is this software?
Aiohttp by Aiohttp
⚠️ Risk & Real-World Impact
Worst Case
HTTP request smuggling leading to cache poisoning, session hijacking, or bypass of security controls by manipulating how downstream servers interpret malformed requests.
Likely Case
Limited impact due to lack of known exploitation methods; primarily a parser inconsistency that could be leveraged in specific chained attacks.
If Mitigated
Minimal impact with proper input validation and updated versions; the vulnerability requires specific conditions to be exploitable.
🎯 Exploit Status
No known exploitation methods exist; the advisory mentions only potential for request smuggling without confirmed techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.13.3
Vendor Advisory: https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mqqc-3gqh-h2x8
Restart Required: Yes
Instructions:
1. Update AIOHTTP using pip: 'pip install --upgrade aiohttp==3.13.3' 2. Restart any services using AIOHTTP. 3. Verify the update with 'pip show aiohttp'.
🔧 Temporary Workarounds
Input validation middleware
allAdd custom middleware to reject HTTP requests containing non-ASCII characters in Range headers before they reach the vulnerable parser.
Implement custom aiohttp middleware that checks request headers for invalid Range values
🧯 If You Can't Patch
- Implement a web application firewall (WAF) with rules to block HTTP requests containing non-ASCII characters in headers.
- Deploy reverse proxies that normalize or reject malformed Range headers before they reach the vulnerable AIOHTTP server.
🔍 How to Verify
Check if Vulnerable:
Check AIOHTTP version with 'pip show aiohttp' or 'python -c "import aiohttp; print(aiohttp.__version__)"'. If version is 3.13.2 or lower, the system is vulnerable.Check Version:
python -c "import aiohttp; print(aiohttp.__version__)"Verify Fix Applied:
After updating, verify version is 3.13.3 or higher using the same commands. Test with sample requests containing malformed Range headers to ensure they are rejected.📡 Detection & Monitoring
Log Indicators:
- HTTP 400 errors with malformed Range headers
- Unusual request patterns with non-standard header values
Network Indicators:
- HTTP requests containing non-ASCII characters in Range headers
- Unexpected request smuggling patterns
SIEM Query:
source="web_server" AND (header="Range" AND value MATCHES "[^\x00-\x7F]")