Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/FluidSynth/fluidsynth/commit/772702e00cc6acc7c607efb40283e226
- https://github.com/FluidSynth/fluidsynth/releases/tag/v2.5.6
- https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-976m-35rw-h3m6
FAQ
What is CVE-2026-61714?
CVE-2026-61714 is a vulnerability with a CVSS score of 7.8 (HIGH). 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_...
How severe is CVE-2026-61714?
CVE-2026-61714 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-61714?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.