CVE-2026-61714: Fluidsynth

High severity, CVSS 7.8. EPSS: 0.1% chance of exploitation in the next 30 days.

FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 2.2.4 until 2.5.6, configuring synth.midi-channels above 16 allows the MIDI player to index _fluid_player_t::channel_isplaying outside its fixed-size heap allocation while tracking active channels. The resulting out-of-bounds reads and writes invoke undefined behavior and may compromise confidentiality, integrity, or availability. No crafted MIDI file is required because the unsafe condition is created by the channel-count configuration itself. Keeping synth.midi-channels at its default value of 16 avoids the vulnerable path. This issue is fixed in version 2.5.6.

Affected products

• Fluidsynth Fluidsynth: from 2.2.4, before 2.5.6 (fixed in 2.5.6)

Published 2026-09-18. Last modified 2026-09-25.