{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "2.2.4"
              },
              {
                "fixed": "2.5.6"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "6c807bdd37748411801e93c48fcd5789d5a6a278"
            },
            {
              "fixed": "772702e00cc6acc7c607efb40283e2269211effc"
            },
            {
              "fixed": "e5b11058a619246cea42976dacb76ca54be3d45d"
            }
          ],
          "repo": "https://github.com/fluidsynth/fluidsynth",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-976m-35rw-h3m6"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-122",
      "CWE-125",
      "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61714.json"
  },
  "details": "FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 2.2.4 until 2.5.6, configuring synth.midi-channels above 16 allows the MIDI player to index _fluid_player_t::channel_isplaying outside its fixed-size heap allocation while tracking active channels. The resulting out-of-bounds reads and writes invoke undefined behavior and may compromise confidentiality, integrity, or availability. No crafted MIDI file is required because the unsafe condition is created by the channel-count configuration itself. Keeping synth.midi-channels at its default value of 16 avoids the vulnerable path. This issue is fixed in version 2.5.6.",
  "id": "CVE-2026-61714",
  "modified": "2026-09-20T11:30:41.759036097Z",
  "published": "2026-09-18T20:01:14.342Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/FluidSynth/fluidsynth/releases/tag/v2.5.6"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61714.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-976m-35rw-h3m6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-61714"
    },
    {
      "type": "FIX",
      "url": "https://github.com/FluidSynth/fluidsynth/commit/772702e00cc6acc7c607efb40283e2269211effc"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "FluidSynth: Heap Buffer Overflow in MIDI Player"
}