AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory consumption. This issue is fixed in version 3.14.2.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the
    WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate
    extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory consumption.
    This issue is fixed in version 3.14.2. (CVE-2026-59881)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the     WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate     extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory consumption.
    This issue is fixed in version 3.14.2. (CVE-2026-59881)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
445609	SCA: security update for aiohttp (GHSA-mq44-7p77-q5h7)	Tenable Cloud Security	SCA Checks	Local	medium
445609	SCA: security update for aiohttp (GHSA-mq44-7p77-q5h7)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium
331310	Linux Distros Unpatched Vulnerability : CVE-2026-59881	Nessus	Misc.	Local	medium

Detections

Analytics

CVE-2026-59881

medium

Tenable Plugins

medium

medium

medium