fluidsynth: FluidSynth is a software synthesizer based on the SoundFont 2 specifications
CVE-2026-61721 is fixed in fluidsynth on 1 platform by DEBIAN-CVE-2026-61721 (version 2.5.6+dfsg-1), released July 26, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| fluidsynth · Debian 14 | 2.5.6+dfsg-1 | DEBIAN-CVE-2026-61721 | Jul 26, 2026 |
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