FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From versions 2.5.0 to before 2.5.2, a race condition during unloading of a DLS file can trigger a heap-based use-after-free. A concurrently running thread may be pending to unload a DLS file, leading to use of freed memory, if the synthesizer is being concurrently destroyed, or samples of the (unloaded) DLS file are concurrently used to synthesize audio. This issue has been patched in version 2.5.2. The problem will not occur, when explicitly unloading a DLS file (before synth destruction), provided that at the time of unloading, no samples of the respective file are used by active voices. The problem will not occur in versions of FluidSynth that have been compiled without native DLS support.

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-202d079b40 advisory.

    Update to 2.5.2     Fix for CVE-2025-68617


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 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-16548b7718 advisory.

    Update to 2.5.2     Fix for CVE-2025-68617


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 version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the bf854a37-e180-11f0-ac0c-5404a68ad561 advisory.

    The fluidsynth authors report:
    A race condition during unloading of a DLS file can trigger               a heap-based use-after-free. A concurrently running thread may               be pending to unload a DLS file, leading to use of freed memory, if               the synthesizer is being concurrently destroyed, or samples of               the (unloaded) DLS file are concurrently used to synthesize audio.
              Realistically, both scenarios will result in a denial of service.
              In worst cases, it may result in arbitrary code execution in the               context of an application using FluidSynth.

Tenable has extracted the preceding description block directly from the FreeBSD 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. From versions 2.5.0 to     before 2.5.2, a race condition during unloading of a DLS file can trigger a heap-based use-after-free. A     concurrently running thread may be pending to unload a DLS file, leading to use of freed memory, if the     synthesizer is being concurrently destroyed, or samples of the (unloaded) DLS file are concurrently used     to synthesize audio. This issue has been patched in version 2.5.2. The problem will not occur, when     explicitly unloading a DLS file (before synth destruction), provided that at the time of unloading, no     samples of the respective file are used by active voices. The problem will not occur in versions of     FluidSynth that have been compiled without native DLS support. (CVE-2025-68617)

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

ID	Name	Product	Family	Severity
280117	Fedora 42 : fluidsynth (2025-202d079b40)	Nessus	Fedora Local Security Checks	high
280110	Fedora 43 : fluidsynth (2025-16548b7718)	Nessus	Fedora Local Security Checks	high
279987	FreeBSD : fluidsynth -- Use after free when using DLS files (bf854a37-e180-11f0-ac0c-5404a68ad561)	Nessus	FreeBSD Local Security Checks	high
279700	Linux Distros Unpatched Vulnerability : CVE-2025-68617	Nessus	Misc.	high

Detections

Analytics

CVE-2025-68617

high

Tenable Plugins

high

high

high

high