Unrated

UBUNTU-CVE-2026-61721

Type: withdrawalSource: 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 loader assigns file-controlled wsmp.loop_start and wsmp.loop_length values to samples without calling fluid_sample_validate() or fluid_sample_sanitize_loop(). A crafted DLS file can place sample loop points beyond the sample buffer, causing out-of-bounds reads during audio rendering, undefined behavior, possible memory disclosure, and denial of service. Builds compiled with the CMake option enable-native-dls set to OFF do not expose the affected parser. This issue is fixed in version 2.5.6.

Announced 18 Sept 2026Group revision 1

Original source ↗

UBUNTU-CVE-2026-61721

Primary source · Revision 1 · Withdrawn

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

Security context

Source reference: osv:UBUNTU-CVE-2026-61721

fluidsynth

Source reference: /affected/0/package/name

Affected versions: 1.1.6-2
Source reference: /affected/0/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

fluidsynth

Source reference: /affected/1/package/name

Affected versions: 1.1.6-2build1
Source reference: /affected/1/versions
1.1.6-3
Source reference: /affected/1/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

fluidsynth

Source reference: /affected/2/package/name

Affected versions: 1.1.6-4
Source reference: /affected/2/versions
1.1.8-1
Source reference: /affected/2/versions
1.1.8-2
Source reference: /affected/2/versions
1.1.8-3
Source reference: /affected/2/versions
1.1.9-1
Source reference: /affected/2/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

fluidsynth

Source reference: /affected/3/package/name

Affected versions: 1.1.11-4
Source reference: /affected/3/versions
1.1.11-4ubuntu1
Source reference: /affected/3/versions
2.1.0-1
Source reference: /affected/3/versions
2.1.1-2
Source reference: /affected/3/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

fluidsynth

Source reference: /affected/4/package/name

Affected versions: 2.1.7-1.1
Source reference: /affected/4/versions
2.2.4-2
Source reference: /affected/4/versions
2.2.5-1
Source reference: /affected/4/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

fluidsynth

Source reference: /affected/5/package/name

Affected versions: 2.3.3-2.1
Source reference: /affected/5/versions
2.3.4-1
Source reference: /affected/5/versions
2.3.4-1build1
Source reference: /affected/5/versions
2.3.4-1build2
Source reference: /affected/5/versions
2.3.4-1build3
Source reference: /affected/5/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

fluidsynth

Source reference: /affected/6/package/name

Affected versions: 2.4.7+dfsg-2
Source reference: /affected/6/versions
2.4.8+dfsg-1
Source reference: /affected/6/versions
Fixed versions: Not stated in this record
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"
          }
        ]
      }
    ],
    "package": {
      "name": "fluidsynth",
      "purl": "pkg:deb/ubuntu/fluidsynth?arch=source&distro=trusty",
      "ecosystem": "Ubuntu:14.04:LTS"
    },
    "versions": [
      "1.1.6-2"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61721.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "fluidsynth",
          "binary_version": "1.1.6-2"
        },
        {
          "binary_name": "libfluidsynth1",
          "binary_version": "1.1.6-2"
        }
      ]
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "fluidsynth",
      "purl": "pkg:deb/ubuntu/fluidsynth?arch=source&distro=xenial",
      "ecosystem": "Ubuntu:16.04:LTS"
    },
    "versions": [
      "1.1.6-2build1",
      "1.1.6-3"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61721.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "fluidsynth",
          "binary_version": "1.1.6-3"
        },
        {
          "binary_name": "libfluidsynth1",
          "binary_version": "1.1.6-3"
        }
      ]
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "fluidsynth",
      "purl": "pkg:deb/ubuntu/fluidsynth?arch=source&distro=bionic",
      "ecosystem": "Ubuntu:18.04:LTS"
    },
    "versions": [
      "1.1.6-4",
      "1.1.8-1",
      "1.1.8-2",
      "1.1.8-3",
      "1.1.9-1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61721.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "fluidsynth",
          "binary_version": "1.1.9-1"
        },
        {
          "binary_name": "libfluidsynth1",
          "binary_version": "1.1.9-1"
        }
      ]
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "fluidsynth",
      "purl": "pkg:deb/ubuntu/fluidsynth?arch=source&distro=focal",
      "ecosystem": "Ubuntu:20.04:LTS"
    },
    "versions": [
      "1.1.11-4",
      "1.1.11-4ubuntu1",
      "2.1.0-1",
      "2.1.1-2"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61721.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "fluidsynth",
          "binary_version": "2.1.1-2"
        },
        {
          "binary_name": "libfluidsynth2",
          "binary_version": "2.1.1-2"
        }
      ]
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "fluidsynth",
      "purl": "pkg:deb/ubuntu/fluidsynth?arch=source&distro=jammy",
      "ecosystem": "Ubuntu:22.04:LTS"
    },
    "versions": [
      "2.1.7-1.1",
      "2.2.4-2",
      "2.2.5-1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61721.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "fluidsynth",
          "binary_version": "2.2.5-1"
        },
        {
          "binary_name": "libfluidsynth3",
          "binary_version": "2.2.5-1"
        }
      ]
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "fluidsynth",
      "purl": "pkg:deb/ubuntu/fluidsynth?arch=source&distro=noble",
      "ecosystem": "Ubuntu:24.04:LTS"
    },
    "versions": [
      "2.3.3-2.1",
      "2.3.4-1",
      "2.3.4-1build1",
      "2.3.4-1build2",
      "2.3.4-1build3"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61721.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "fluidsynth",
          "binary_version": "2.3.4-1build3"
        },
        {
          "binary_name": "libfluidsynth3",
          "binary_version": "2.3.4-1build3"
        }
      ]
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "fluidsynth",
      "purl": "pkg:deb/ubuntu/fluidsynth?arch=source&distro=resolute",
      "ecosystem": "Ubuntu:26.04:LTS"
    },
    "versions": [
      "2.4.7+dfsg-2",
      "2.4.8+dfsg-1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61721.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "fluidsynth",
          "binary_version": "2.4.8+dfsg-1"
        },
        {
          "binary_name": "libfluidsynth3",
          "binary_version": "2.4.8+dfsg-1"
        }
      ]
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #63801 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 19:50:26 GMT
Publisher date: Fri, 18 Sep 2026 20:17:00 GMT

Read the original announcement

Revision history

25 Oct 2026UBUNTU-CVE-2026-61721 · Revision 1Withdrawn