UBUNTU-CVE-2026-61721

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Source
https://ubuntu.com/security/CVE-2026-61721
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61721.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-61721
Upstream
Withdrawn
2026-10-01T16:12:49Z
Published
2026-09-18T20:17:00Z
Modified
2026-10-01T19:09:37Z
Severity
  • 8.0 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 2.5.0 until 2.5.6, the native DLS loader assigns file-controlled wsmp.loop_start and wsmp.loop_length values to samples without calling fluid_sample_validate() or fluid_sample_sanitize_loop(). A crafted DLS file can place sample loop points beyond the sample buffer, causing out-of-bounds reads during audio rendering, undefined behavior, possible memory disclosure, and denial of service. Builds compiled with the CMake option enable-native-dls set to OFF do not expose the affected parser. This issue is fixed in version 2.5.6.

References

Affected packages

Ubuntu:14.04:LTS
fluidsynth

Package

Name
fluidsynth
Purl
pkg:deb/ubuntu/fluidsynth?arch=source&distro=trusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.1.6-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "fluidsynth",
            "binary_version": "1.1.6-2"
        },
        {
            "binary_name": "libfluidsynth1",
            "binary_version": "1.1.6-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61721.json"
Ubuntu:16.04:LTS
fluidsynth

Package

Name
fluidsynth
Purl
pkg:deb/ubuntu/fluidsynth?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.1.6-2build1
1.1.6-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "fluidsynth",
            "binary_version": "1.1.6-3"
        },
        {
            "binary_name": "libfluidsynth1",
            "binary_version": "1.1.6-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61721.json"
Ubuntu:18.04:LTS
fluidsynth

Package

Name
fluidsynth
Purl
pkg:deb/ubuntu/fluidsynth?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
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": "1.1.9-1"
        },
        {
            "binary_name": "libfluidsynth1",
            "binary_version": "1.1.9-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61721.json"
Ubuntu:20.04:LTS
fluidsynth

Package

Name
fluidsynth
Purl
pkg:deb/ubuntu/fluidsynth?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.1.11-4
1.1.11-4ubuntu1
2.*
2.1.0-1
2.1.1-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "fluidsynth",
            "binary_version": "2.1.1-2"
        },
        {
            "binary_name": "libfluidsynth2",
            "binary_version": "2.1.1-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61721.json"
Ubuntu:22.04:LTS
fluidsynth

Package

Name
fluidsynth
Purl
pkg:deb/ubuntu/fluidsynth?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.1.7-1.1
2.2.4-2
2.2.5-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "fluidsynth",
            "binary_version": "2.2.5-1"
        },
        {
            "binary_name": "libfluidsynth3",
            "binary_version": "2.2.5-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61721.json"
Ubuntu:24.04:LTS
fluidsynth

Package

Name
fluidsynth
Purl
pkg:deb/ubuntu/fluidsynth?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
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": "2.3.4-1build3"
        },
        {
            "binary_name": "libfluidsynth3",
            "binary_version": "2.3.4-1build3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61721.json"
Ubuntu:26.04:LTS
fluidsynth

Package

Name
fluidsynth
Purl
pkg:deb/ubuntu/fluidsynth?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.4.7+dfsg-2
2.4.8+dfsg-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "fluidsynth",
            "binary_version": "2.4.8+dfsg-1"
        },
        {
            "binary_name": "libfluidsynth3",
            "binary_version": "2.4.8+dfsg-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61721.json"