CVE-2025-69228
📋 TL;DR
This vulnerability in AIOHTTP allows attackers to craft malicious requests that cause uncontrolled memory consumption in servers using Request.post() handlers. This can lead to denial of service by exhausting server memory. All applications using AIOHTTP versions 3.13.2 and below with Request.post() handlers are affected.
💻 Affected Systems
- aiohttp
📦 What is this software?
Aiohttp by Aiohttp
⚠️ Risk & Real-World Impact
Worst Case
Complete server freeze and denial of service, potentially affecting multiple applications on the same host due to memory exhaustion.
Likely Case
Service disruption and degraded performance as memory resources are consumed, leading to application crashes or unresponsiveness.
If Mitigated
Minimal impact with proper request validation, rate limiting, and memory monitoring in place.
🎯 Exploit Status
Exploitation requires crafting specific requests but does not require authentication or special privileges.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.13.3
Vendor Advisory: https://github.com/aio-libs/aiohttp/security/advisories/GHSA-6jhg-hg63-jvvf
Restart Required: Yes
Instructions:
1. Update aiohttp: pip install --upgrade aiohttp==3.13.3
2. Restart all affected services
3. Verify the version with: pip show aiohttp
🔧 Temporary Workarounds
Implement request size limits
allAdd middleware to limit request body size before processing
# Python middleware example:
from aiohttp import web
@web.middleware
async def limit_request_size(request, handler):
max_size = 10 * 1024 * 1024 # 10MB
if request.content_length and request.content_length > max_size:
raise web.HTTPRequestEntityTooLarge()
return await handler(request)
app = web.Application(middlewares=[limit_request_size])
Disable vulnerable handlers
allTemporarily disable or modify Request.post() handlers
# Replace Request.post() with safer alternatives
# Instead of: await request.post()
# Use: await request.read() with size limits
MAX_SIZE = 10 * 1024 * 1024
data = await request.read()
if len(data) > MAX_SIZE:
raise web.HTTPRequestEntityTooLarge()
🧯 If You Can't Patch
- Implement strict request size limits at reverse proxy/load balancer level
- Deploy memory monitoring and automatic restart policies for affected services
🔍 How to Verify
Check if Vulnerable:
Check aiohttp version: pip show aiohttp | grep VersionCheck Version:
pip show aiohttp | grep VersionVerify Fix Applied:
Confirm version is 3.13.3 or higher: pip show aiohttp | grep Version📡 Detection & Monitoring
Log Indicators:
- Unusually large request bodies
- Memory usage spikes
- Process restarts due to memory exhaustion
- HTTP 413 responses
Network Indicators:
- Large POST requests to endpoints using Request.post()
- Repeated requests with large payloads
SIEM Query:
source="aiohttp" AND (message="memory" OR message="large request" OR status=413)