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.
Scores
CVSS v3
5.3
EPSS
0.0004
EPSS Percentile
13.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-444
Status
published
Products (2)
aiohttp/aiohttp
< 3.13.3
pypi/aiohttp
0 - 3.13.3PyPI
Published
Jan 06, 2026
Tracked Since
Feb 18, 2026