python-engineio is a Python implementation of the Engine.IO realtime client and server. Versions prior to 4.13.2 have two specific configurations of the python-engineio server in which the size of incoming messages is not checked before the messages are loaded into memory. An attacker can take advantage of these to cause unnecessary memory allocations in the python-engineio server. The two cases are POST requests, when using ASGI with the long polling transport and WebSocket messages, when using Aiohttp with the WebSocket transport. Version 4.13.2 addresses this issue. ASGI severs now only load the body of incoming requests into memory after the client is confirmed to be known and authenticated, and the payload size is below the maximum allowed size. Requests that do not comply with these requirements are discarded. Aiohttp servers configure the maximum payload size in the underlying WebSocket layer from Aiohttp, so that large messages are discarded by Aiohttp before they are delivered to python-engineio.

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-2026:3085-1 advisory.

    - CVE-2026-48802: remote user can cause the creation of unnecessary background       threads in the server through the heartbeat mechanism and cause a DoS       (bsc#1269544).
    - CVE-2026-48809: size of incoming messages is not checked before they are loaded       into memory and allows remote users to cause a DoS via excessive memory allocation       (bsc#1269545).

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-2026:21182-1 advisory.

    Changes in python-python-engineio:

    - CVE-2026-48802: remote user can cause the creation of unnecessary       background threads in the server through the heartbeat mechanism       and cause a DoS (bsc#1269544)
    - CVE-2026-48809: size of incoming messages is not checked before       they are loaded into memory and allows remote users to cause a DoS       via excessive memory allocation (bsc#1269545)

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.

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

  - python-engineio is a Python implementation of the Engine.IO realtime client and server. Versions prior to
    4.13.2 have two specific configurations of the python-engineio server in which the size of incoming
    messages is not checked before the messages are loaded into memory. An attacker can take advantage of
    these to cause unnecessary memory allocations in the python-engineio server. The two cases are POST
    requests, when using ASGI with the long polling transport and WebSocket messages, when using Aiohttp with
    the WebSocket transport. Version 4.13.2 addresses this issue. ASGI severs now only load the body of
    incoming requests into memory after the client is confirmed to be known and authenticated, and the payload
    size is below the maximum allowed size. Requests that do not comply with these requirements are discarded.
    Aiohttp servers configure the maximum payload size in the underlying WebSocket layer from Aiohttp, so that
    large messages are discarded by Aiohttp before they are delivered to python-engineio. (CVE-2026-48809)

ID	Name	Product	Family	Type	Severity
327736	SUSE SLED15 / SLES15 Security Update : python-python-engineio (SUSE-SU-2026:3085-1)	Nessus	SuSE Local Security Checks	Local	high
324887	openSUSE 16 Security Update : python-python-engineio (openSUSE-SU-2026:21182-1)	Nessus	SuSE Local Security Checks	Local	high
444085	SCA: security update for python-engineio (GHSA-m9gh-vj53-gvh9)	Tenable Cloud Security	SCA Checks	Local	high
444085	SCA: security update for python-engineio (GHSA-m9gh-vj53-gvh9)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

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CVE-2026-48809

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