CVE-2026-61714FluidSynth: Heap Buffer Overflow in MIDI Player
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No exploitation reported and no EPSS estimate yet.
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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
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-122, CWE-125, CWE-787
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Awaiting Analysis
- Record last updated
- Sep 25, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
FluidSynth fluidsynth fluidsynth:fluidsynth (from the name) | from 2.2.4, < 2.5.6 | CNA record |
References
- https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-976m-35rw-h3m6x-refsource-confirm
- https://github.com/FluidSynth/fluidsynth/commit/772702e00cc6acc7c607efb40283e2269211effcx-refsource-misc
- https://github.com/FluidSynth/fluidsynth/releases/tag/v2.5.6x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.