aio-libs aiohttp up to 3.14.0 denial of service

Summaryinfo

A vulnerability has been found in aio-libs aiohttp up to 3.14.0 and classified as problematic. This issue affects some unknown processing. This manipulation causes denial of service. The identification of this vulnerability is CVE-2026-54280. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in aio-libs aiohttp up to 3.14.0 and classified as problematic. Affected by this vulnerability is an unknown part. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. The summary by CVE is:

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, payload resources are not closed correctly when a client disconnects in the middle of a write. If a payload is using an open file or similar limited resource, then an attacker may be able to cause resource starvation temporarily until garbage collection or similar closes the file. This vulnerability is fixed in 3.14.1.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-54280 since 06/12/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 322134 (Linux Distros Unpatched Vulnerability : CVE-2026-54280), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.14.1 eliminates this vulnerability. Applying the patch a762eda5242f6490d6ba667533193f8b473ad587 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 Tenable (322134) and EUVD (EUVD-2026-38316). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• aio-libs

Name

• aiohttp

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.14.0

License

• open-source

Website

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

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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