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

AIOHTTP vulnerable to DoS when bypassing asserts

CVE-2025-69227

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.

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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

4

News mentions

0

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