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 remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4031-1 advisory.

    - CVE-2026-59881: excessive resource consumption due to WebSocket client accepting compressed frames     without negotiated       permessage-deflate (bsc#1273125).
    - CVE-2026-69243: HTTP request smuggling via the WebSocket upgrade procedure (bsc#1273553).
    - CVE-2026-69244: out-of-bounds heap read in the C response parser while building an error message for a     malformed       response (bsc#1273552).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4113-1 advisory.

    - CVE-2026-59881: excessive resource consumption due to WebSocket client accepting compressed frames     without negotiated       permessage-deflate (bsc#1273125).
    - CVE-2026-69243: HTTP request smuggling via the WebSocket upgrade procedure (bsc#1273553).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote openSUSE 16 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21687-1 advisory.

    - CVE-2026-59881: excessive resource consumption due to WebSocket client accepting compressed frames     without negotiated       permessage-deflate (bsc#1273125).
    - CVE-2026-69243: HTTP request smuggling via the WebSocket upgrade procedure (bsc#1273553).
    - CVE-2026-69244: out-of-bounds heap read in the C response parser while building an error message for a     malformed       response (bsc#1273552).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 46 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-84f7af8f97 advisory.

    Automatic update for python-aiohttp-3.14.3-3.fc46.

    ##### **Changelog**

    ```
    * Mon Aug 24 2026 Benjamin A. Beasley <code@musicinmybrain.net> - 3.14.3-3
    - Preemptively patch for Cython 3.3 compatibility
    * Mon Aug 24 2026 Benjamin A. Beasley <code@musicinmybrain.net> - 3.14.3-2
    - Remove a test skip thats no longer needed
    * Thu Aug 20 2026 Benjamin A. Beasley <code@musicinmybrain.net> - 3.14.3-1
    - Update to 3.14.3
    - Security fix for CVE-2026-34993; fixes RHBZ#2511060
    - Security fix for CVE-2026-59881; fixes RHBZ#2509739
    - Security fix for CVE-2026-69243; fixes RHBZ#2519530
    - Security fix for CVE-2026-69244; fixes RHBZ#2519529
    * Thu Aug 20 2026 Benjamin A. Beasley <code@musicinmybrain.net> - 3.13.5-13
    - Use the provisional pyproject declarative buildsystem

    ```

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 45 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-e76e1f737b advisory.

    Automatic update for python-aiohttp-3.14.3-3.fc45.

    ##### **Changelog**

    ```
    * Mon Aug 24 2026 Benjamin A. Beasley <code@musicinmybrain.net> - 3.14.3-3
    - Preemptively patch for Cython 3.3 compatibility
    * Mon Aug 24 2026 Benjamin A. Beasley <code@musicinmybrain.net> - 3.14.3-2
    - Remove a test skip thats no longer needed
    * Thu Aug 20 2026 Benjamin A. Beasley <code@musicinmybrain.net> - 3.14.3-1
    - Update to 3.14.3
    - Security fix for CVE-2026-34993; fixes RHBZ#2511060
    - Security fix for CVE-2026-59881; fixes RHBZ#2509739
    - Security fix for CVE-2026-69243; fixes RHBZ#2519530
    - Security fix for CVE-2026-69244; fixes RHBZ#2519529
    * Thu Aug 20 2026 Benjamin A. Beasley <code@musicinmybrain.net> - 3.13.5-13
    - Use the provisional pyproject declarative buildsystem

    ```

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

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
462113	Echo: aiohttp: security update to 3.14.2python-aiohttp: security update to 3.14.3-1	Tenable Cloud Security	Echo Local Security Checks	Local	medium
462113	Echo: aiohttp: security update to 3.14.2python-aiohttp: security update to 3.14.3-1	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	medium
348478	SUSE SLED15 / SLES15 Security Update : python-aiohttp (SUSE-SU-2026:4031-1)	Nessus	SuSE Local Security Checks	Local	high
345845	SUSE SLES15 Security Update : python-aiohttp (SUSE-SU-2026:4113-1)	Nessus	SuSE Local Security Checks	Local	medium
342109	openSUSE 16 Security Update : python-aiohttp (openSUSE-SU-2026:21687-1)	Nessus	SuSE Local Security Checks	Local	high
339122	Fedora 46 : python-aiohttp (2026-84f7af8f97)	Nessus	Fedora Local Security Checks	Local	high
339121	Fedora 45 : python-aiohttp (2026-e76e1f737b)	Nessus	Fedora Local Security Checks	Local	high
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

high

medium

high

high

high

medium

medium

medium