DEBIAN-CVE-2026-58264

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Source
https://security-tracker.debian.org/tracker/CVE-2026-58264
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-58264.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-58264
Upstream
Published
2026-09-18T20:17:18Z
Modified
2026-09-19T05:00:10Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
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.

References

Affected packages

Debian:12 / fluidsynth

Package

Name
fluidsynth
Purl
pkg:deb/debian/fluidsynth?arch=source&distro=bookworm

Affected ranges

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

Affected versions

2.*
2.3.1-2
2.3.2-1
2.3.3-1
2.3.3-2
2.3.3-2.1
2.3.4-1
2.3.5-1
2.3.6-1
2.4.0-1~hurd.1
2.4.0-1~hurd.2
2.4.0-1
2.4.2-1
2.4.3-1
2.4.3+dfsg-1
2.4.3+dfsg-2
2.4.3+dfsg-3
2.4.3+dfsg-4
2.4.4+dfsg-1
2.4.6+dfsg-1
2.4.7+dfsg-1
2.4.7+dfsg-2
2.4.8+dfsg-1
2.5.0+dfsg-1
2.5.1+dfsg-1
2.5.1+dfsg-2
2.5.2+dfsg-1
2.5.3+dfsg-1
2.5.4+dfsg-1
2.5.5+dfsg-1
2.5.5+dfsg-2
2.5.6+dfsg-1
2.5.7+dfsg-1
2.6.0+dfsg-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-58264.json"

Debian:13 / fluidsynth

Package

Name
fluidsynth
Purl
pkg:deb/debian/fluidsynth?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.4.4+dfsg-1+deb13u3

Affected versions

2.*
2.4.4+dfsg-1
2.4.4+dfsg-1+deb13u1
2.4.4+dfsg-1+deb13u2

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-58264.json"

Debian:14 / fluidsynth

Package

Name
fluidsynth
Purl
pkg:deb/debian/fluidsynth?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.5.6+dfsg-1

Affected versions

2.*
2.4.4+dfsg-1
2.4.6+dfsg-1
2.4.7+dfsg-1
2.4.7+dfsg-2
2.4.8+dfsg-1
2.5.0+dfsg-1
2.5.1+dfsg-1
2.5.1+dfsg-2
2.5.2+dfsg-1
2.5.3+dfsg-1
2.5.4+dfsg-1
2.5.5+dfsg-1
2.5.5+dfsg-2

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-58264.json"