fluidsynth is a software synthesizer based on the SoundFont 2 specifications. A use after free violation was discovered in fluidsynth, that can be triggered when loading an invalid SoundFont file.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-016723 advisory.

    fluidsynth is a software synthesizer based on the SoundFont 2 specifications. A use after free violation     was discovered in fluidsynth, that can be triggered when loading an invalid SoundFont file.

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.

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

  - fluidsynth is a software synthesizer based on the SoundFont 2 specifications. A use after free violation     was discovered in fluidsynth, that can be triggered when loading an invalid SoundFont file.
    (CVE-2021-21417)

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

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

  - fluidsynth is a software synthesizer based on the SoundFont 2 specifications. A use after free violation
    was discovered in fluidsynth, that can be triggered when loading an invalid SoundFont file.
    (CVE-2021-21417)

ID	Name	Product	Family	Severity
316140	Unity Linux 20.1070e Security Update: fluidsynth (UTSA-2026-016723)	Nessus	Unity Linux Local Security Checks	medium
257213	Linux Distros Unpatched Vulnerability : CVE-2021-21417	Nessus	Misc.	medium
404483	Alpine: multiple fluidsynth packages: security update to 2.1.8-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	medium
404483	Alpine: multiple fluidsynth packages: security update to 2.1.8-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	medium

Detections

Analytics

CVE-2021-21417

medium

Tenable Plugins

medium

medium

medium

medium