CVE-2026-61721

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-61721
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61721.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-61721
Aliases
  • GHSA-59ph-rx8r-8p4j
Downstream
Published
2026-09-18T20:00:29Z
Modified
2026-09-25T08:27:35Z
Severity
  • 8.0 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H CVSS Calculator
Summary
FluidSynth: Heap-based buffer overrun for DLS samples
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-122",
        "CWE-125"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61721.json"
}
References

Affected packages

Git / github.com/fluidsynth/fluidsynth

Affected ranges

Type
GIT
Repo
https://github.com/fluidsynth/fluidsynth
Events
Introduced
df432e151dcaf463b1ecc7e873803bfa19733fd3
Fixed
2354c2a9acdb26de7cdcd37c903ee108f46c0a7d
Fixed
e5b11058a619246cea42976dacb76ca54be3d45d
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "2.5.0"
        },
        {
            "fixed": "2.5.6"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v2.*
v2.5.0
v2.5.1
v2.5.2
v2.5.3
v2.5.4
v2.5.5

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61721.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "316832849941334984658522297308767385325",
                "284594243347044839103798002494813733799",
                "101061516766831570691312734986969741846",
                "176523278482922968298966940381046405274",
                "283224059878043331887379742755905471351",
                "106710001654129884608613215939524450720",
                "256740305250907577948450650015923853604",
                "324646973724361892125972574381539228414",
                "151879616635388207302910934755008770036",
                "308164686764875488323929518412140933807",
                "255659686306477176586757850780243470324",
                "150753281272061286743857011530083515074",
                "278053772028894953740625918029923128653",
                "40904740786826514132595079873731701927"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-61721-1773f9d6",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/fluidsynth/fluidsynth/commit/2354c2a9acdb26de7cdcd37c903ee108f46c0a7d",
        "target": {
            "file": "src/sfloader/fluid_dls.cpp"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "247883939806704223976831480007442085940",
            "length": 8536
        },
        "id": "CVE-2026-61721-a4d6fc8d",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/fluidsynth/fluidsynth/commit/2354c2a9acdb26de7cdcd37c903ee108f46c0a7d",
        "target": {
            "file": "src/sfloader/fluid_dls.cpp",
            "function": "fluid_dls_font::fluid_dls_font"
        }
    }
]
vanir_signatures_modified 
"2026-09-25T08:27:35Z"