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.
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Affected Vendors & Products
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History
Tue, 06 Jan 2026 21:15:00 +0000
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ssvc
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Tue, 06 Jan 2026 14:30:00 +0000
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Aio-libs
Aio-libs aiohttp Session Aio-libs Project Aio-libs Project aiohttp Aiohttp Aiohttp aio-libs Aiohttp aiohttp |
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Aio-libs
Aio-libs aiohttp Session Aio-libs Project Aio-libs Project aiohttp Aiohttp Aiohttp aio-libs Aiohttp aiohttp |
Tue, 06 Jan 2026 12:15:00 +0000
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threat_severity
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cvssV3_1
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Mon, 05 Jan 2026 23:45:00 +0000
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| 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. | |
| Title | AIOHTTP vulnerable to DoS through chunked messages | |
| Weaknesses | CWE-770 | |
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cvssV4_0
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-01-05T23:37:52.955Z
Updated: 2026-01-06T19:02:09.630Z
Reserved: 2025-12-29T20:53:34.537Z
Link: CVE-2025-69229
Updated: 2026-01-06T14:24:48.256Z
Status : Awaiting Analysis
Published: 2026-01-06T00:15:48.347
Modified: 2026-01-08T18:09:23.230
Link: CVE-2025-69229
ReportizFlow