CVE-2025-69227
High
Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below allow for an infinite loop to occur when assert statements are bypassed, resulting in a DoS attack when processing a POST body. If optimizations are enabled (-O or PYTHONOPTIMIZE=1), and the application includes a handler that uses the Request.post() method, then an attacker may be able to execute a DoS attack with a specially crafted message. This issue is fixed in version 3.13.3.
SeverityHigh
CVSS7.5
Exploit probability—
ProductAiohttp
PublishedJan 6, 2026
First seenJan 6, 2026
Weakness typeCWE-835CWE-835
How to fix
Update
- aiohttp aiohttp3.13.3 or later
- aiohttp3.13.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| aiohttp aiohttp | v < 3.13.3 | 3.13.3 |
| aiohttpPyPI | v < 3.13.3 | 3.13.3 |
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