CVE-2026-61714
Publication date 18 September 2026
Last updated 6 October 2026
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| fluidsynth | 26.04 LTS resolute |
Fixed 2.4.8+dfsg-1ubuntu0.1~esm1
|
| 24.04 LTS noble |
Fixed 2.3.4-1ubuntu0.1~esm1
|
|
| 22.04 LTS jammy |
Fixed 2.2.5-1ubuntu0.1~esm1
|
|
| 20.04 LTS focal |
Not affected
|
|
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty |
Not affected
|
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CVSS version: CVSS v3.0
Base score
7.8 · High
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
References
Related Ubuntu Security Notices (USN)
- USN-8885-1
- FluidSynth vulnerabilities
- 6 October 2026