FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 2.2.4 until 2.5.6, configuring synth.midi-channels above 16 allows the MIDI player to index _fluid_player_t::channel_isplaying outside its fixed-size heap allocation while tracking active channels. The resulting out-of-bounds reads and writes invoke undefined behavior and may compromise confidentiality, integrity, or availability. No crafted MIDI file is required because the unsafe condition is created by the channel-count configuration itself. Keeping synth.midi-channels at its default value of 16 avoids the vulnerable path. This issue is fixed in version 2.5.6.

The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8885-1 advisory.

    It was discovered that FluidSynth did not properly validate the channel argument of the pitch_bend_range     command. A remote attacker could possibly use this issue to cause FluidSynth to crash, resulting in a     denial of service, or execute arbitrary code. (CVE-2026-58264)

    It was discovered that FluidSynth incorrectly handled configurations with more than 16 MIDI channels in     its MIDI player, leading to a heap buffer overflow. An attacker could possibly use this issue to cause     FluidSynth to crash, resulting in a denial of service, or execute arbitrary code. This issue only affected     Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-61714)

Tenable has extracted the preceding description block directly from the Ubuntu 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 44 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-6debf34169 advisory.

    This build adds a patch to fix CVE-2026-61714.


Tenable has extracted the preceding description block directly from the Fedora 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 remote Fedora 45 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-e5a087cb33 advisory.

    This build adds a patch to fix CVE-2026-61714.


Tenable has extracted the preceding description block directly from the Fedora 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:

  - FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 2.2.4 until 2.5.6,
    configuring synth.midi-channels above 16 allows the MIDI player to index
    _fluid_player_t::channel_isplaying outside its fixed-size heap allocation while tracking active channels.
    The resulting out-of-bounds reads and writes invoke undefined behavior and may compromise confidentiality,
    integrity, or availability. No crafted MIDI file is required because the unsafe condition is created by
    the channel-count configuration itself. Keeping synth.midi-channels at its default value of 16 avoids the
    vulnerable path. This issue is fixed in version 2.5.6. (CVE-2026-61714)

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 2.2.4 until 2.5.6,     configuring synth.midi-channels above 16 allows the MIDI player to index
    _fluid_player_t::channel_isplaying outside its fixed-size heap allocation while tracking active channels.
    The resulting out-of-bounds reads and writes invoke undefined behavior and may compromise confidentiality,     integrity, or availability. No crafted MIDI file is required because the unsafe condition is created by     the channel-count configuration itself. Keeping synth.midi-channels at its default value of 16 avoids the     vulnerable path. This issue is fixed in version 2.5.6. (CVE-2026-61714)

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

ID	Name	Product	Family	Type	Severity
363808	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : FluidSynth vulnerabilities (USN-8885-1)	Nessus	Ubuntu Local Security Checks	Local	critical
363787	Fedora 44 : musescore (2026-6debf34169)	Nessus	Fedora Local Security Checks	Local	high
363367	Fedora 45 : musescore (2026-e5a087cb33)	Nessus	Fedora Local Security Checks	Local	high
461501	Echo: fluidsynth: security update to 2.4.4+dfsg-1+deb13u2+e1	Tenable Cloud Security	Echo Local Security Checks	Local	high
461501	Echo: fluidsynth: security update to 2.4.4+dfsg-1+deb13u2+e1	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
329708	Linux Distros Unpatched Vulnerability : CVE-2026-61714	Nessus	Misc.	Local	high

Detections

Analytics

CVE-2026-61714

high

Tenable Plugins

critical

high

high

high

high

high