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DEBIAN-CVE-2026-61720

Type: advisorySource: OSV1 source record

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.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-61720

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-61720

fluidsynth

Source reference: /affected/0/package/name

Affected versions
2.4.4+dfsg-1

Source reference: /affected/0/versions

2.4.6+dfsg-1

Source reference: /affected/0/versions

2.4.7+dfsg-1

Source reference: /affected/0/versions

2.4.7+dfsg-2

Source reference: /affected/0/versions

2.4.8+dfsg-1

Source reference: /affected/0/versions

2.5.0+dfsg-1

Source reference: /affected/0/versions

2.5.1+dfsg-1

Source reference: /affected/0/versions

2.5.1+dfsg-2

Source reference: /affected/0/versions

2.5.2+dfsg-1

Source reference: /affected/0/versions

2.5.3+dfsg-1

Source reference: /affected/0/versions

2.5.4+dfsg-1

Source reference: /affected/0/versions

2.5.5+dfsg-1

Source reference: /affected/0/versions

2.5.5+dfsg-2

Source reference: /affected/0/versions

Fixed versions
2.5.6+dfsg-1

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.5.6+dfsg-1"
          }
        ]
      }
    ],
    "package": {
      "name": "fluidsynth",
      "purl": "pkg:deb/debian/fluidsynth?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "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"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-61720.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#15052 · Revision 1
Added to Heist Feed
Publisher date
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