CVE-2025-69227: 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…

medium6.6CVSS 4.0

AVNACLATNPRNUINVCNVINVAHSCNSINSANEUCRXIRXARXMAVXMACXMATXMPRXMUIXMVCXMVIXMVAXMSCXMSIXMSAXSXAUXRXVXREXUX

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.

Affected

4 ranges

Vendor	Product	Version range	Fixed in
aio-libs	aiohttp	< 3.13.3	3.13.3
aiohttp	aiohttp	< 3.13.3	3.13.3
aiohttp	aiohttp	>= 0 < 3.13.3	3.13.3
debian	python-aiohttp	< python-aiohttp 3.13.3-1 (forky)	python-aiohttp 3.13.3-1 (forky)

CVSS provenance

nvdv4.06.6MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

osv7.5HIGH