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

AIOHTTP Regex Mismatch Allows Unicode in ASCII-Only Protocol Fields

CVE-2025-69225

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below contain parser logic which allows non-ASCII decimals to be present in the Range header. There is no known impact, but there is the possibility that there's a method to exploit a request smuggling vulnerability. 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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