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DEBIAN-CVE-2026-61723

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 ptbl chunks with the unsigned expression cues * 4 + cbsize without checking whether the multiplication and addition fit in 32 bits. A crafted DLS file can supply a large cues value that wraps the expression and passes the chunk-size check, causing poolcues.resize(cues) to request approximately four gigabytes and the parser to read billions of entries beyond the chunk boundary. The excessive allocation and invalid reads can cause denial of service. Builds with enable-native-dls set to OFF are not exposed. This issue is fixed in version 2.5.6.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-61723

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-2026-61723

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-2026-61723.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#15019 · Revision 1
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Publisher date
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