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[USN-8885-1] FluidSynth vulnerabilities

Posted on 06 October 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8885-1
October 06, 2026

fluidsynth vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in FluidSynth.

Software Description:
- fluidsynth: Real-time MIDI software synthesizer

Details:

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)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
fluidsynth 2.4.8+dfsg-1ubuntu0.1~esm1
Available with Ubuntu Pro
libfluidsynth3 2.4.8+dfsg-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 24.04 LTS
fluidsynth 2.3.4-1ubuntu0.1~esm1
Available with Ubuntu Pro
libfluidsynth3 2.3.4-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 22.04 LTS
fluidsynth 2.2.5-1ubuntu0.1~esm1
Available with Ubuntu Pro
libfluidsynth3 2.2.5-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 20.04 LTS
fluidsynth 2.1.1-2ubuntu0.1~esm1
Available with Ubuntu Pro
libfluidsynth2 2.1.1-2ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
fluidsynth 1.1.9-1ubuntu0.1~esm1
Available with Ubuntu Pro
libfluidsynth1 1.1.9-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 16.04 LTS
fluidsynth 1.1.6-3ubuntu0.1~esm1
Available with Ubuntu Pro
libfluidsynth1 1.1.6-3ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 14.04 LTS
fluidsynth 1.1.6-2ubuntu0.1~esm1
Available with Ubuntu Pro
libfluidsynth1 1.1.6-2ubuntu0.1~esm1
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8885-1
CVE-2026-58264, CVE-2026-61714

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