CVE-2026-61721

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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
2026-09-19T11:45:32Z
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
e5b11058a619246cea42976dacb76ca54be3d45d
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "2.5.0"
        },
        {
            "fixed": "2.5.6"
        }
    ],
    "source": "AFFECTED_FIELD"
}

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"