Vulnerability Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. In versions 3.13.2 and below, handling of chunked messages can result in excessive blocking CPU usage when receiving a large number of chunks. If an application makes use of the request.read() method in an endpoint, it may be possible for an attacker to cause the server to spend a moderate amount of blocking CPU time (e.g. 1 second) while processing the request. This could potentially lead to DoS as the server would be unable to handle other requests during that time. This issue is fixed in version 3.13.3.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Aiohttp | Aiohttp | < 3.13.3 |
Related Weaknesses (CWE)
References
- https://github.com/aio-libs/aiohttp/commit/4ed97a4e46eaf61bd0f05063245f613469700Patch
- https://github.com/aio-libs/aiohttp/commit/dc3170b56904bdf814228fae70a5501a42a6cPatch
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-g84x-mcqj-x9qqPatchVendor Advisory
FAQ
What is CVE-2025-69229?
CVE-2025-69229 is a vulnerability with a CVSS score of 5.3 (MEDIUM). AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. In versions 3.13.2 and below, handling of chunked messages can result in excessive blocking CPU usage when receiving a l...
How severe is CVE-2025-69229?
CVE-2025-69229 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-69229?
Check the references section above for vendor advisories and patch information. Affected products include: Aiohttp Aiohttp.