aio-libs aiohttp up to 3.13.2 Endpoint request.read allocation of resources

Summaryinfo

A vulnerability was found in aio-libs aiohttp up to 3.13.2 and classified as critical. Affected is the function request.read of the component Endpoint. Such manipulation leads to allocation of resources. This vulnerability is uniquely identified as CVE-2025-69229. The attack can be launched remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in aio-libs aiohttp up to 3.13.2 and classified as critical. Affected by this issue is the function request.read of the component Endpoint. The manipulation with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2025-69229 since 12/29/2025. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 281876 (Linux Distros Unpatched Vulnerability : CVE-2025-69229), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.13.3 eliminates this vulnerability. Applying the patch 4ed97a4e46eaf61bd0f05063245f613469700229 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at CNNVD (CNNVD-202601-957) and Tenable (281876). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• aio-libs

Name

• aiohttp

Version

• 3.13.0
• 3.13.1
• 3.13.2

License

• open-source

Website

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

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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