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CVE-2025-69229

AIOHTTP vulnerable to DoS through chunked messages

Published: Jan 5, 2026Updated: Feb 13, 2026 Sources: CVE List NVD GHSA BDUCWE-770
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.3%
Top 74.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
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Weaknesses

CWE-770

Affected Products

aiohttpaiohttp
Library
OSS Libraries / web-framework
aiohttpaio-libs
Library
OSS Libraries / web-framework
aiohttpPyPIOSS Libraries
aiohttpСообщество свободного программного обеспечения
LibraryLibrary
OSS Libraries / generic-library
Debian GNU/LinuxСообщество свободного программного обеспечения
On-premOS
Operating Systems / linux-distro
aiohttposs-projectOSS Libraries
aio-libsoss-projectOSS Librariesaka aiohttp, aiosmtpd, aiohttp session
pypipackage-ecosystemOSS Libraries
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
and 1 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/aio-libs/aiohttp/commit/4ed97a4e46eaf61bd0f05063245f613469700229
github.com
https://github.com/aio-libs/aiohttp/commit/dc3170b56904bdf814228fae70a5501a42a6c712
github.com
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-g84x-mcqj-x9qq
github.com
and 5 more references View all →

Timeline

Published
Jan 5, 2026
Last Updated
Feb 13, 2026

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