UBUNTU-CVE-2026-61722 (CVE-2026-61722)
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 2.5.0 until 2.5.6, the native DLS parser validates articulation chunks using the unsigned expression cbsize + connblocks * 12 without first ensuring that the multiplication and addition fit in 32 bits. A crafted DLS file can supply a large connblocks value that wraps the expression and bypasses the chunk-size check, after which the parser performs approximately one billion 12-byte iterations beyond the chunk boundary. The excessive processing and invalid reads can cause denial of service. Builds with the CMake option enable-native-dls set to OFF do not expose the parser. This issue is fixed in version 2.5.6.
Severity
6.8 (Medium)
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 2.5.0 until 2.5.6, the native DLS parser validates articulation chunks using the unsigned expression cbsize + connblocks * 12 without first ensuring that the multiplication and addition fit in 32 bits. A crafted DLS file can supply a large connblocks value that wraps the expression and bypasses the chunk-size check, after which the parser performs approximately one billion 12-byte iterations beyond the chunk boundary. The excessive processing and invalid reads can cause denial of service. Builds with the CMake option enable-native-dls set to OFF do not expose the parser. This issue is fixed in version 2.5.6.",
"id": "UBUNTU-CVE-2026-61722",
"modified": "2026-09-23T23:31:26Z",
"published": "2026-09-18T20:17:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-61722"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-61722"
},
{
"type": "REPORT",
"url": "https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-hp72-35pr-6h6r"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-61722"
]
}
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Sightings
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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