CVE-2026-61721
FluidSynth: Heap-based buffer overrun for DLS samples
- State
- Published
- Severity
- 8.0 High
- Published
- Sep 18, 2026
- Updated
- Sep 18, 2026
- Reserved
- Jul 10, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 8.0 High | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H | GitHub_M |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
fluidsynthFluidSynth |
|
References
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