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DEBIAN-CVE-2026-61722

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 native DLS parser validates articulation chunks using the unsigned expression cbsize + connblocks * 12 without first ensuring that the multiplication and addition fit in 32 bits. A crafted DLS file can supply a large connblocks value that wraps the expression and bypasses the chunk-size check, after which the parser performs approximately one billion 12-byte iterations beyond the chunk boundary. The excessive processing and invalid reads can cause denial of service. Builds with the CMake option enable-native-dls set to OFF do not expose the parser. This issue is fixed in version 2.5.6.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-61722

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-2026-61722

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-2026-61722.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#6108 · Revision 1
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Publisher date
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