Heap-based Buffer Overflow Affecting fluidsynth package, versions <2.4.8+dfsg-1ubuntu0.1~esm1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU2604-FLUIDSYNTH-18323460
- published1 Oct 2026
- disclosed18 Sept 2026
Introduced: 18 Sep 2026
NewCVE-2026-61714 (opens in a new tab)How to fix?
Upgrade Ubuntu:26.04 fluidsynth to version 2.4.8+dfsg-1ubuntu0.1~esm1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream fluidsynth package and not the fluidsynth package as distributed by Ubuntu.
See How to fix? for Ubuntu:26.04 relevant fixed versions and status.
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.