websocket-driver is a WebSocket protocol handler with pluggable I/O. Prior to 0.8.1, draft versions of the WebSocket protocol in websocket-driver include a length header that allows an arbitrarily large integer to be encoded as bytes with the high bit set, and a server or client can send an indefinite sequence of 0x80 or higher bytes that the peer parses into an ever-growing Ruby integer. This can make a WebSocket connection consume an unbounded amount of memory and lead to the host process running out of memory. This issue is fixed in version 0.8.1.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-104954 advisory.

    websocket-driver is a WebSocket protocol handler with pluggable I/O. Prior to 0.8.1, draft versions of the     WebSocket protocol in websocket-driver include a length header that allows an arbitrarily large integer to     be encoded as bytes with the high bit set, and a server or client can send an indefinite sequence of 0x80     or higher bytes that the peer parses into an ever-growing Ruby integer. This can make a WebSocket     connection consume an unbounded amount of memory and lead to the host process running out of memory. This     issue is fixed in version 0.8.1.

Tenable has extracted the preceding description block directly from the Unity Linux 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:

  - websocket-driver is a WebSocket protocol handler with pluggable I/O. Prior to 0.8.1, draft versions of the
    WebSocket protocol in websocket-driver include a length header that allows an arbitrarily large integer to
    be encoded as bytes with the high bit set, and a server or client can send an indefinite sequence of 0x80
    or higher bytes that the peer parses into an ever-growing Ruby integer. This can make a WebSocket
    connection consume an unbounded amount of memory and lead to the host process running out of memory. This
    issue is fixed in version 0.8.1. (CVE-2026-54463)

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

  - websocket-driver is a WebSocket protocol handler with pluggable I/O. Prior to 0.8.1, draft versions of the     WebSocket protocol in websocket-driver include a length header that allows an arbitrarily large integer to     be encoded as bytes with the high bit set, and a server or client can send an indefinite sequence of 0x80     or higher bytes that the peer parses into an ever-growing Ruby integer. This can make a WebSocket     connection consume an unbounded amount of memory and lead to the host process running out of memory. This     issue is fixed in version 0.8.1. (CVE-2026-54463)

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

ID	Name	Product	Family	Type	Severity
341379	Unity Linux 20.1070e Security Update: rubygem-websocket-driver (UTSA-2026-104954)	Nessus	Unity Linux Local Security Checks	Local	medium
446031	SCA: security update for websocket-driver (GHSA-ghhp-3qvg-889p)	Tenable Cloud Security	SCA Checks	Local	medium
446031	SCA: security update for websocket-driver (GHSA-ghhp-3qvg-889p)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium
327777	Linux Distros Unpatched Vulnerability : CVE-2026-54463	Nessus	Misc.	Local	medium

Detections

Analytics

CVE-2026-54463

medium

Tenable Plugins

medium

medium

medium

medium