UBUNTU-CVE-2026-61720

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Source
https://ubuntu.com/security/CVE-2026-61720
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61720.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-61720
Upstream
Published
2026-09-18T20:17:00Z
Modified
2026-10-06T23:31:43Z
Severity
  • 6.2 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 SF2 parser computes the DMOD modulator count as chunk.size / SF_MOD_SIZE - 1 without rejecting chunks smaller than one record. A crafted SF2 file containing a zero-sized DMOD chunk makes the unsigned subtraction wrap to UINT_MAX, and the parser then attempts billions of SFMod allocations. This exhausts process memory and causes denial of service. No workaround is available. This issue is fixed in version 2.5.6.

References

Affected packages

Ubuntu:Pro:14.04:LTS
fluidsynth

Package

Name
fluidsynth
Purl
pkg:deb/ubuntu/fluidsynth?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

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

Affected versions

1.*
1.1.6-2
1.1.6-2ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "fluidsynth",
            "binary_version":  "1.1.6-2ubuntu0.1~esm1"
        },
        {
            "binary_name":  "libfluidsynth1",
            "binary_version":  "1.1.6-2ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61720.json"
Ubuntu:Pro:16.04:LTS
fluidsynth

Package

Name
fluidsynth
Purl
pkg:deb/ubuntu/fluidsynth?arch=source&distro=esm-apps-legacy%2Fxenial

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
1.1.6-3ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "fluidsynth",
            "binary_version":  "1.1.6-3ubuntu0.1~esm1"
        },
        {
            "binary_name":  "libfluidsynth1",
            "binary_version":  "1.1.6-3ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61720.json"
Ubuntu:Pro:18.04:LTS
fluidsynth

Package

Name
fluidsynth
Purl
pkg:deb/ubuntu/fluidsynth?arch=source&distro=esm-apps%2Fbionic

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
1.1.9-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "fluidsynth",
            "binary_version":  "1.1.9-1ubuntu0.1~esm1"
        },
        {
            "binary_name":  "libfluidsynth1",
            "binary_version":  "1.1.9-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61720.json"
Ubuntu:Pro:20.04:LTS
fluidsynth

Package

Name
fluidsynth
Purl
pkg:deb/ubuntu/fluidsynth?arch=source&distro=esm-apps%2Ffocal

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
2.1.1-2ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "fluidsynth",
            "binary_version":  "2.1.1-2ubuntu0.1~esm1"
        },
        {
            "binary_name":  "libfluidsynth2",
            "binary_version":  "2.1.1-2ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61720.json"
Ubuntu:Pro:22.04:LTS
fluidsynth

Package

Name
fluidsynth
Purl
pkg:deb/ubuntu/fluidsynth?arch=source&distro=esm-apps%2Fjammy

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
2.2.5-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "fluidsynth",
            "binary_version":  "2.2.5-1ubuntu0.1~esm1"
        },
        {
            "binary_name":  "libfluidsynth3",
            "binary_version":  "2.2.5-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61720.json"
Ubuntu:Pro:24.04:LTS
fluidsynth

Package

Name
fluidsynth
Purl
pkg:deb/ubuntu/fluidsynth?arch=source&distro=esm-apps%2Fnoble

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
2.3.4-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "fluidsynth",
            "binary_version":  "2.3.4-1ubuntu0.1~esm1"
        },
        {
            "binary_name":  "libfluidsynth3",
            "binary_version":  "2.3.4-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61720.json"
Ubuntu:Pro:26.04:LTS
fluidsynth

Package

Name
fluidsynth
Purl
pkg:deb/ubuntu/fluidsynth?arch=source&distro=esm-apps%2Fresolute

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
2.4.8+dfsg-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "fluidsynth",
            "binary_version":  "2.4.8+dfsg-1ubuntu0.1~esm1"
        },
        {
            "binary_name":  "libfluidsynth3",
            "binary_version":  "2.4.8+dfsg-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61720.json"