DEBIAN-CVE-2026-61720

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Source
https://security-tracker.debian.org/tracker/CVE-2026-61720
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-61720.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-61720
Upstream
Published
2026-09-18T20:17:18Z
Modified
2026-09-22T08:47:28Z
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
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

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-2026-61720.json"