python-socketio is a Python implementation of the Socket.IO realtime client and server. The python-socketio server stores binary `EVENT` and `ACK` messages in memory while it waits to receive their binary attachments. Once all the attachments are received, these messages are then processed. Prior to version 5.16.4, an attacker can submit a binary message and intentionally omit sending one or more of its attachments to cause the message along with the partial list of received attachments to stay in memory for a long time. Version 5.16.4 takes the following measures to address this issue: Binary packets are only accepted from authenticated clients and, when a client disconnects, the server checks if there is a partial binary message being held for the client and deletes it.

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

  - python-socketio is a Python implementation of the Socket.IO realtime client and server. The python-     socketio server stores binary `EVENT` and `ACK` messages in memory while it waits to receive their binary     attachments. Once all the attachments are received, these messages are then processed. Prior to version     5.16.4, an attacker can submit a binary message and intentionally omit sending one or more of its     attachments to cause the message along with the partial list of received attachments to stay in memory for     a long time. Version 5.16.4 takes the following measures to address this issue: Binary packets are only     accepted from authenticated clients and, when a client disconnects, the server checks if there is a     partial binary message being held for the client and deletes it. (CVE-2026-48804)

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

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2026:3086-1 advisory.

    - CVE-2026-48804: Binary attachment accumulation can cause denial of service (bsc#1269491).

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

Note that Nessus has not tested for this issue 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-socketio is a Python implementation of the Socket.IO realtime client and server. The python-
    socketio server stores binary `EVENT` and `ACK` messages in memory while it waits to receive their binary
    attachments. Once all the attachments are received, these messages are then processed. Prior to version
    5.16.4, an attacker can submit a binary message and intentionally omit sending one or more of its
    attachments to cause the message along with the partial list of received attachments to stay in memory for
    a long time. Version 5.16.4 takes the following measures to address this issue: Binary packets are only
    accepted from authenticated clients and, when a client disconnects, the server checks if there is a
    partial binary message being held for the client and deletes it. (CVE-2026-48804)

ID	Name	Product	Family	Type	Severity
335297	Linux Distros Unpatched Vulnerability : CVE-2026-48804	Nessus	Misc.	Local	high
327743	SUSE SLED15 / SLES15 Security Update : python-python-socketio (SUSE-SU-2026:3086-1)	Nessus	SuSE Local Security Checks	Local	high
444078	SCA: security update for python-socketio (GHSA-5w7q-77mv-v69f)	Tenable Cloud Security	SCA Checks	Local	high
444078	SCA: security update for python-socketio (GHSA-5w7q-77mv-v69f)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

Detections

Analytics

CVE-2026-48804

high

Tenable Plugins

high

high

high

high