UBUNTU-CVE-2026-58264 (CVE-2026-58264)
Vulnerability from osv_ubuntu – Published: 2026-09-18 20:17 – Updated: 2026-09-23 23:31 – Source website
VLAI
Details
FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 1.1.2 until 2.5.6, the FluidSynth command handler accepts a pitch_bend_range command whose channel argument is not bounds checked before the supplied value is written through the selected synth channel. An out-of-range channel can therefore cause an out-of-bounds heap write, leading to denial of service or possible code execution. The issue is remotely reachable when the TCP server is enabled through new_fluid_server() or fluidsynth -s, and it is locally reachable through malicious commands delivered to the FluidSynth shell on standard input. Applications that do not use the shell, command handler, or TCP server are not affected. This issue is fixed in version 2.5.6.
Severity
9.8 (Critical)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "fluidsynth",
"binary_version": "1.1.6-2"
},
{
"binary_name": "libfluidsynth1",
"binary_version": "1.1.6-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:14.04:LTS",
"name": "fluidsynth",
"purl": "pkg:deb/ubuntu/fluidsynth@1.1.6-2?arch=source\u0026distro=trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.1.6-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "fluidsynth",
"binary_version": "1.1.6-3"
},
{
"binary_name": "libfluidsynth1",
"binary_version": "1.1.6-3"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "fluidsynth",
"purl": "pkg:deb/ubuntu/fluidsynth@1.1.6-3?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.1.6-2build1",
"1.1.6-3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "fluidsynth",
"binary_version": "1.1.9-1"
},
{
"binary_name": "libfluidsynth1",
"binary_version": "1.1.9-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "fluidsynth",
"purl": "pkg:deb/ubuntu/fluidsynth@1.1.9-1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.1.6-4",
"1.1.8-1",
"1.1.8-2",
"1.1.8-3",
"1.1.9-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "fluidsynth",
"binary_version": "2.1.1-2"
},
{
"binary_name": "libfluidsynth2",
"binary_version": "2.1.1-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "fluidsynth",
"purl": "pkg:deb/ubuntu/fluidsynth@2.1.1-2?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.1.11-4",
"1.1.11-4ubuntu1",
"2.1.0-1",
"2.1.1-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "fluidsynth",
"binary_version": "2.2.5-1"
},
{
"binary_name": "libfluidsynth3",
"binary_version": "2.2.5-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "fluidsynth",
"purl": "pkg:deb/ubuntu/fluidsynth@2.2.5-1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.1.7-1.1",
"2.2.4-2",
"2.2.5-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "fluidsynth",
"binary_version": "2.3.4-1build3"
},
{
"binary_name": "libfluidsynth3",
"binary_version": "2.3.4-1build3"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "fluidsynth",
"purl": "pkg:deb/ubuntu/fluidsynth@2.3.4-1build3?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.3.3-2.1",
"2.3.4-1",
"2.3.4-1build1",
"2.3.4-1build2",
"2.3.4-1build3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "fluidsynth",
"binary_version": "2.4.8+dfsg-1"
},
{
"binary_name": "libfluidsynth3",
"binary_version": "2.4.8+dfsg-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "fluidsynth",
"purl": "pkg:deb/ubuntu/fluidsynth@2.4.8+dfsg-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.4.7+dfsg-2",
"2.4.8+dfsg-1"
]
}
],
"aliases": [],
"details": "FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 1.1.2 until 2.5.6, the FluidSynth command handler accepts a pitch_bend_range command whose channel argument is not bounds checked before the supplied value is written through the selected synth channel. An out-of-range channel can therefore cause an out-of-bounds heap write, leading to denial of service or possible code execution. The issue is remotely reachable when the TCP server is enabled through new_fluid_server() or fluidsynth -s, and it is locally reachable through malicious commands delivered to the FluidSynth shell on standard input. Applications that do not use the shell, command handler, or TCP server are not affected. This issue is fixed in version 2.5.6.",
"id": "UBUNTU-CVE-2026-58264",
"modified": "2026-09-23T23:31:24Z",
"published": "2026-09-18T20:17:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-58264"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-58264"
},
{
"type": "REPORT",
"url": "https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-mqmq-w63q-cj94"
},
{
"type": "REPORT",
"url": "https://github.com/FluidSynth/fluidsynth/pull/1796"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-58264"
]
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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