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Moderate severityOSV Advisory· Published Jan 5, 2026· Updated Jan 6, 2026

AIOHTTP vulnerable to DoS through chunked messages

CVE-2025-69229

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
aiohttpPyPI
< 3.13.33.13.3

Affected products

55

Patches

Vulnerability mechanics

References

5

News mentions

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