{"id":"CVE-2026-61714","title":"FluidSynth is a software synthesizer based on the SoundFont 2 specifications","summary":"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…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwe":["CWE-122","CWE-125","CWE-787"],"vendor":"FluidSynth","product":"fluidsynth","affected":["fluidsynth >= 2.2.4, < 2.5.6"],"published":"2026-09-18","updated":"2026-09-18","sourceUpdated":"2026-09-18T20:17:18.270","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-61714","references":[{"url":"https://github.com/FluidSynth/fluidsynth/commit/772702e00cc6acc7c607efb40283e2269211effc","label":"security-advisories@github.com"},{"url":"https://github.com/FluidSynth/fluidsynth/releases/tag/v2.5.6","label":"security-advisories@github.com"},{"url":"https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-976m-35rw-h3m6","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-18T20:51:25.674Z","epss":0.00143,"epssPercentile":0.03969,"slug":"CVE-2026-61714","body":"## Overview\n\nFluidSynth 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}