FluidSynth: Heap Buffer Overflow in MIDI Player

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Summary

CVECVE-2026-61714
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-18 20:17:18 UTC
Updated2026-09-25 17:17:09 UTC
DescriptionFluidSynth 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS: 0.001840000 probability, percentile 0.071860000 (date 2026-09-27)

Problem Types: CWE-122 | CWE-125 | CWE-787 | CWE-122 CWE-122: Heap-based Buffer Overflow | CWE-125 CWE-125: Out-of-bounds Read | CWE-787 CWE-787: Out-of-bounds Write

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA FluidSynth Fluidsynth affected >= 2.2.4, < 2.5.6 Not specified

References

ReferenceSourceLinkTags
github.com/FluidSynth/fluidsynth/commit/772702e00cc6acc7c607efb40283e226... [email protected] github.com
github.com/FluidSynth/fluidsynth/releases/tag/v2.5.6 [email protected] github.com
github.com/FluidSynth/fluidsynth/security/advisories/GHSA-976m-35rw-h3m6 [email protected] github.com
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