CVE-2026-61721: high-severity vulnerability in fluidsynth
FluidSynth: Heap-based buffer overrun for DLS samples
Published
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8epss 0.2%
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.
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
Affected products
FluidSynth · fluidsynthRelated CVEs — fluidsynth
In the same product, most dangerous first.
CVE-2021-21417HIGHUse after free in fluidsynthEPSS 0.9%CVE-2026-58264CRITICALFluidSynth: Heap-based buffer overrunEPSS 0.6%CVE-2025-68617HIGHUse after free in fluidsynthEPSS 0.2%CVE-2026-61722MEDIUMFluidSynth: DLS Articulation Chunk Integer OverflowEPSS 0.2%CVE-2026-111123MEDIUMFluidSynth through 2.6.1 Out-of-Bounds Write via SoundFont Modulator DestinationEPSS 0.2%CVE-2026-61720MEDIUMFluidSynth: SF2 DMOD Chunk Unsigned UnderflowEPSS 0.2%