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Ubuntu 20.04 LTS / 22.04 LTS : FluidSynth vulnerabilities (USN-8885-1)

critical Nessus Plugin ID 363808

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 20.04 LTS / 22.04 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.

Solution

Update the affected fluidsynth, libfluidsynth2 and / or libfluidsynth3 packages.

See Also

https://ubuntu.com/security/notices/USN-8885-1

Plugin Details

Severity: Critical

ID: 363808

File Name: ubuntu_USN-8885-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 10/7/2026

Updated: 10/7/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.9

Percentile: 96.51

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-58264

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:fluidsynth, p-cpe:/a:canonical:ubuntu_linux:libfluidsynth2, p-cpe:/a:canonical:ubuntu_linux:libfluidsynth3

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Ease: No known exploits are available

Patch Publication Date: 10/6/2026

Vulnerability Publication Date: 7/16/2026

Reference Information

CVE: CVE-2026-58264, CVE-2026-61714

IAVB: 2026-B-0192

USN: 8885-1