TI-2025-42683 Aliases CVE-2025-69229 GHSA-g84x-mcqj-x9qq

AIOHTTP vulnerable to DoS through chunked messages

LOW 35CWE-770Published 2026-01-05 · Updated 2026-01-06

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Partial Red Hat: 9 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-770.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00404 34th percentileScored 2026-11-07

Fix Partial aiohttp (aio-libs): 3.13.3aiohttp (PyPI): 3.13.3Red Hat: 9 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
aio-libs	aiohttp	before 3.13.3	3.13.3	Patch available	CNA
—	aiohttp (PyPI)	before 3.13.3	3.13.3	Patch available	GHSA-g84x-mcqj-x9qq

aiohttp Vendoraio-libs Affected before 3.13.3 Fixed in 3.13.3 Patch available CNA
aiohttp (PyPI) Vendor— Affected before 3.13.3 Fixed in 3.13.3 Patch available GHSA-g84x-mcqj-x9qq

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:aiohttp:aiohttp::::::::	before 3.13.3	Vulnerable	Aiohttp

cpe:2.3:a:aiohttp:aiohttp:*:*:*:*:*:*:*:* Versions before 3.13.3 Vulnerable ·Aiohttp

Remediation

Fix · CNA aiohttp (aio-libs) Fixed in 3.13.3
Fix · GHSA-g84x-mcqj-x9qq aiohttp (PyPI) Fixed in 3.13.3 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Migration Toolkit for Containers	Affected	No fix yet: Fix deferred
OpenShift Lightspeed	Affected	No fix yet: Fix deferred
OpenShift Service Mesh 2	Affected	No fix yet: Fix deferred
Red Hat AI Inference Server	Affected	No fix yet: Fix deferred
Red Hat Ansible Automation Platform 2	Affected	No fix yet: Fix deferred
Red Hat Ansible Automation Platform Ansible Core 2	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux AI (RHEL AI) 3	Affected	No fix yet: Fix deferred
Red Hat OpenShift AI (RHOAI)	Affected	No fix yet: Fix deferred
Red Hat Satellite 6	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2025-69229
2026-10-03 Alias added: GHSA-g84x-mcqj-x9qq

References

Patch 3

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2025-69229

Other 1

https://github.com/aio-libs/aiohttp

TI-2025-38826 aiomysql allows arbitrary access to client files through vulnerability of a malicious MySQL server CVSS 4.0HIGH 8.2
TI-2024-15436 aiohttp.web.static(follow_symlinks=True) is vulnerable to directory traversal CVSS 3.1HIGH 7.5
TI-2023-25769 Request smuggling in aiohttp CVSS 3.1HIGH 7.5
TI-2023-18906 aiohttp vulnerable to HTTP request smuggling CVSS 3.1HIGH 7.5
TI-2023-26746 aiohttp's ClientSession is vulnerable to CRLF injection via version CVSS 3.1HIGH 7.2
TI-2026-66145 Multidict: Reference leak in CIMultiDict/MultiDict items-view union and subtraction CVSS 3.1MEDIUM 5.3

See all 59 →

Sources

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